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11501.

There are two sets A and B each of which consists of three numbers in A.P.whose sum is 15 andwhere D and d are the common differences such that D-d=1. If p/q=7/8, where p and q are the product of the numbers ,respectively, andd gt 0 in the two sets . The sum of the products of the numbers is set A taken two at at time is

Answer»

51
71
74
86

Solution :Let NUMBERS in set A be a-D,a,a+D and those in set B be b-d,b,b+d. Now,
3a=3b=15
or a=b=5
Set A = {5-D,5,5+D}
set B = {5-d,5,5+d}
where D=d+1
ALSO,
`p/q=(5(25-D^(2)))/(5(25-d^(2)))=7/8`
`rArr25(8-7)=8(d+1)^(2)-7d^(2)`
`rArrd=-17,1` but `dgt0rArrd=1`
So, the numbers in set A are 3,5,7 and the nnumbers in set are 4,5,6.
Now, sum of PRODUCT of numbers in set are 4,5,6.
Now, sum of product of numbers in set A taken two at a TIME is `3xx5+3xx7+5xx7=71`. The sum of product ofnumbers in set B taken two at a time is `4xx5+5xx6+6xx4=74`.
Also,
`p=3xx5xx7=105 and q=4xx5xx6=120`
`rArrq-p=15`
11502.

If int(e^(x-1))/((x^(2)-5x+4))2xdx=AF(x-1)+BF(x-4)+c and F(x)=int (e^(x))/(x)dx, then-

Answer»

`A=(-2)/(3)`
`B=(4)/(3)E^(3)`
`A=(2)/(3)`
`B=(8)/(3)e^(3)`

ANSWER :A,D
11503.

If the area of the triangle with vertices (x,0) and C(1,2,4) are the vertices of the triangle ABC, then the length of its median through the vertex A is -

Answer»

`-2`
`-4`
`-6`
`-8`

ANSWER :C
11504.

Let f : R to R be a differentiable function given by f(x) =x^(3)-3x + 2020. If g(x) is a continuous function defined by g(x) ={{:("Minimum" f(t),0 le t le x, 0 le x le 1),("Maximum" f(t), 1 lt t le x, 1 lt x le 2):} and m and M be the least and the greatest value of g(x) on [0,2] then which one of the following is correct?

Answer»

M-m=2
m=2020
M=2022
m=2019

Solution :`f(x) = 3X^(2) -3`
For `0 le x le 1`, f(x) is STRICTLY DECREASING
`rArr g(x) =x^(2) - 3x + 2020, 0 le x le 1`
For `1 lt x le 2`, f(x) is strictly increasing `rArr g(x) = xp^(3) - 3x + 2020, 1 lt x le 2`
11505.

An ellipse having the coordinate axes as its axes and its major axis along Y-axis, passes through the point (-3,1) and has eccentricity sqrt((2)/(5)). Then its equation is

Answer»

`3x^(2)+5y^(2)-15=0`
`5x^(2)+3Y^(2)-32=0`
`3x^(2)+5y^(2)-32=0`
`5x^(2)+3y^(2)-48=0`

ANSWER :C
11506.

Find a unit vector perpendicular to each of the vectors veca+vecb and veca-vecb when veca= 3hati+2hatj+2hatk, vecb=hati+2hatj- 2hatk

Answer»


ANSWER :`2/3hati-2/3hatj-1/3hatk`
11507.

Evalute the following integrals int (x^(2) + 1)/(x^(4) + 1)dx

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Answer :`(1)/(SQRT(2)) TAN^(-1) ((x^(2) - 1)/(sqrt(2)x ) ) + c `
11508.

Solve system of linear equations , using matrix method if exists 3x-y=5 6x-2y=3

Answer»


ANSWER :No SOLUTION
11509.

Evaluate the following definite intergrals . overset(3) underset(2)int x^(2)dx

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ANSWER :`(19)/(3)`
11510.

Check the continuity of the following functions : f(x)=x^(2)" at "x=0.

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ANSWER :CONTINUOUS
11511.

Statement-I : The combined equatioin of the pair of asymptotes of the hyperola 2xy+6x+y+5=0 is 2xy+6x+y+3=0 Statement II: The angle between the asymptotes of the hyperola xy-2y+3x+sqrt3=0 is 60^(@). Which of above statement is true.

Answer»

A) only I
B) only II
C) both I and II
D) NEITHER I nor II

Answer :A
11512.

Evaluate {:[(x,x+1),(x-1,x)]:}

Answer»


ANSWER :` 1`
11513.

Solve x^(2) - 10x + 21 lt 0 by algebric method and graphical method.

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ANSWER :`X in (3, 7)`
11514.

Differentiate a^(x) w.r.t. x, where a is a positive constant.

Answer»


ANSWER :`a^(X) LOG a`.
11515.

Evaluate the following integrals int_(2)^(6)sqrt((6-x)(x-2))dx

Answer»


ANSWER :`2 PI`
11516.

Using elementary row transformations find the inverse of the matrix [{:(3,0,-1),(2,3,0),(0,4,1):}]

Answer»

SOLUTION :`[{:(3,-4," "3),(-2," "3,-2),(8,-12," "9):}]`
11517.

Ifalpha, beta , gammaare therootsof theequationx^3 - px^2 + qx +r=0then( alpha+ beta ) ( beta + gamma) ( gamma+ alpha)=

Answer»

`2(p^2 -3Q)`
`r-pq`
`qp+r`
`(p^2 -2Q)/(r^2)`

ANSWER :C
11518.

Evaluation of definite integrals by subsitiution and properties of its : int_(-2)^(0)(x^(3)+3x^(2)+3x+3+(x+1)cos(x+1))dx=...............

Answer»

`-4`
0
4
6

Answer :C
11519.

A rectangle with altitude x is inscribed in a triangle ABC with the bae b and altitude h. Express the perimeter P and area S of the rectangle as fuction of x.

Answer»


ANSWER :`P=2b+2(1-b/n)X; S=b(1-x/h)x`
11520.

The mean of n items is bar(x). If the first item is increased by 1, second by 2 and so on, then the new mean is

Answer»

`BAR(X) + n`
`bar(x) + (n)/(2)`
`bar(x) + (n+1)/(2)`
`bar(x) + (n+1)`

Answer :C
11521.

If f(x)=5x^3+4x^2 - 13 x-25 andf(x-3)= 5x^3 - 41x^2 + 98x + kthenk=

Answer»

85
`-85`
`105`
`-105`

ANSWER :B
11522.

Find the number of ways of arranging 4 boys and 3 girls around a circle so that all the girls sit together.

Answer»


ANSWER :144
11523.

The set of all point for which f(x) = (|x-3|)/(|x-2|) + 1/[1+x] is continuous is (where [*] represents greatest integer function)

Answer»

R
`R-[-1,0]`
`R-({2} CUP [-1,0])`
`R-{(-1,0) cup N, n in I}`

ANSWER :D
11524.

The order and degree of the differential equation [1 + ((dy)/(dx))^(2) + sin((dy)/(dx))]^(3//4)= (d^(2)y)/(dx^(2))

Answer»

`{:("order = 2"),("DEGREE = 3"):}`
`{:("order = 2"),("degree = 4"):}`
degree = `(3)/(4)`
`{:("order = 2"),("degree = not DEFINED"):}`

ANSWER :D
11525.

A function y=f(x) is given by x = phi (t)=t^(5)-5t^(3)-20t+7y= Psi (t)=4t^(3)-3t^(2)-18t+3, -2 lt t lt 2Find the maximum and minimum value of the function.

Answer»


Answer :Maximum X = 3, y = 14
Minimum `x=(-1033)/(32), y=-17(1)/(4)`
11526.

If (2,-1,2) and (K,3,5)are the traidsof directionratiosof twolines and the anglebetween them is 45^(@) , then is a value of k is

Answer»

2
3
4
6

Answer :C
11527.

A and B are among 20 persons sit at random along a round table. Find the probability that there are any 6 persons between A and B.

Answer»


ANSWER :`-(2)/(19)`
11528.

Using differentials, find the approximate value of each of the following upto 3 place of decimal. (iii) sqrt(0.6)

Answer»


ANSWER :0.775
11529.

If one root of 24x^(3) - 14x^(2) - 63x + 45 = 0is the double the other then the roots are

Answer»

`-1,1/2,2`
`2,2,-1`
`3/4,3/2,-5/3`
`-3/2 ,-3/4,-1/3`

ANSWER :C
11530.

Let a, b and c be three non-coplanar vectors and let p,q and r be the vector defined by p=(b xx c)/([abc]), q=(c xx a)/([abc]), r=(a xx b)/([abc]). Then, (a+b). p+(b+c).q +(c+a).r is equal to

Answer»

0
1
2
3

Answer :D
11531.

If a and b(a gt b) are points of discontinuity of the function f(x)={:{(3-2x^2, "for", x le 0),(2x+3, "for" ,0 lt x le 1),(2x^2-3x,"for",1 lt x lt 2),(2x-3,"for", 2 le x lt 3),(|x|,"for" , ge 3):} then 3a-b =

Answer»

3
7
5
1

Answer :C
11532.

y gex + 2 2x + 3y le6 In which of the following does the shaded region represent the solution set in the xy-plane to the system of inequalities above?

Answer»




Solution : The solutions of the FIRST inequality, `y ge X + 2`, lie on or above the line y = x + 2, which is the line that passes through (−2, 0) and (0, 2). The second inequality can be rewritten in slopeintercept form by dividing the second inequality, `2x + 3Y le 6`, by 3 on both SIDES, which yields`2/3x + y le2`, and then subtracting`2/3x` from both sides, which yields `y le-2/3 x+2`. The solutions to this inequality lie on or below the line `y = − 2/3x +2`, which is the line that passes through (0, 2) and (3, 0). The only graph in which the shaded region meets these criteria is choice B.
Choice A is incorrect and may result from REVERSING the inequality sign in the first inequality. Choice C is incorrect and may result from reversing the inequality sign in the second inequality. Choice D is incorrect and may result from reversing the inequality signs in both inequalities.
11533.

If (-2,-1) is a limiting point of a coaxal system of whichx^(2) + y^(2) + 2x + 4y + 7 = 0 is a member, then the equation of the or the gonal system is

Answer»

`(x^(2) + y^(2) + x + 3y) + lambda (2x + 3y + 3) = 0`
`3(x^(2) + y^(2) + x+ 3y) + lambda (x + y + 3) = 0 `
`3(x^(2) + y^(2) - x- 3y) + lambda(x - y-3) = 0 `
`3(x^(2) + y^(2) + 2x + 3y) + 3 lambda (2x + 3y + 63 ) = 0 `

Answer :B
11534.

The product of the distinct (2n)^(th) roots 1+isqrt3 is

Answer»

0
`-1-isqrt3`
`1+isqrt3`
`-1+isqrt3`

ANSWER :B
11535.

Let the transverse axis ofa varying hyperbola be fixed with length of transverse axis being 2a. Then the locus of the point of contact of any tangent drawn to it from a fixed point on conjugate axis is

Answer»

<P>a PARABOLA
a circle
an ellipse
a hyperbola

Solution :Let the hyperbola be `(x^(2))/(a^(2)) -(y^(2))/(b^(2)) =1`. Any tangent to it is `(x)/(a) sec phi - (y)/(b) tan phi =1` (1)
at `Q (a sec phi, b tan theta)`
The tangent CUTS the axis of y at P. The coordinates of P are `(0,-b cot phi)`
As P is fixed `rArr b cot phi = lambda` (say) (2)
Now `x = a sec phi, y = b tan phi` (3)
ELIMINATING b and `phi` from (1),(2),(3), we get `(x^(2))/(a^(2)) -(y)/(lambda) =1`, which clearly is a parabola.
11536.

The value of sin 10^(@) + sin 20^(@) + sin 30^(@) + …. + sin 360^(@) is equal to

Answer»

0
`1//2`
1
2

Answer :A
11537.

The functions f and g are defined as follow : f = {(1,2),(3,5),(4,1) } and g = {(2,3),(5,1),(1,3)}. Find the range of f and g . Also find the composition function fog and gof.

Answer»


SOLUTION :N/A
11538.

Equation of the line through the point (1, 1, 1) and intersecting the lines 2x-y-z-2=0=x+y+z-1 and x-y-z-3=0=2x+4y-z-4.

Answer»

`x-1=0, 7x+17y-3z-134=0`
`x-1=0, 9x+15y-5z-19=0`
`x-1=0, (y-1)/(1)=(z-1)/(3)`
`x-2y+2z-1=0, 9x+15y-5z-19=0`

ANSWER :(B,C)
11539.

Two tangents are drawn from a point(-2,-1)to the curve y^(2) =4x,If alphais the angle between them , then| tan alpha |is equal to

Answer»

`(1)/(3) `
`( 1)/(SQRT3) `
` sqrt3`
` 3`

ANSWER :D
11540.

intxtan^-1xdx

Answer»

SOLUTION :`intxtan^-1xdx`
[`tan^-1x`=1ST FUNCTION
x=2nd function]
=`tan^-1x.x^2/2-int1/(1+x^2) .x^2/2dx` =`x^2/2tan^-1x-1/2x+1/2tan^-1x+C`
(x^2+1)/2 tan^-1x-x/2+C`
11541.

Represent as limit of sum : overset(2)underset(0)int(x^(2)+3)dx

Answer»


ANSWER :`(26)/(3)`
11542.

If f: Rrarr R given by f(x) = (x^3) + 3, then f^-1(x) equals·:

Answer»

6(x^4)+(x^2)+ 12
(x^2)+(6X)+ 12
(x^4)+(6x)+ 12
(x^4)+(6x^2)+ 12

Answer :D
11543.

If the absolute error while calculating the absolute error in volume of a sphere of radius 10 cm is 0.1 cm. Which is the absolute error in volume of the sphere ?

Answer»

`-10PI CM^(3)`
`-20PI cm^(3)`
`-80picm^(3)`
`-40picm^(3)`

ANSWER :D
11544.

The tangent to the curve y=f (x) at the point with absicsa x =1 from an angle of pi//6 and at the point x=2 an angle of pi//3 and at the point x=3 and angle of pi//4 . If f''(x) is contnuous, then the value of int_(1)^(3) f''(x)f'(x)dx+int_(2)^(3)f''(x)dx is

Answer»

`(4sqrt(3)-1)/(3)`
`(3sqrt(3)-1)/(2)`
`(4-3sqrt(3))/(3)`
NONE of these

Answer :C
11545.

Find the area of the parallelogram formed by the lines2x^2+5xy+3y^2=0 and 2x^2+5xy+3y^2+3x+4y+1=0

Answer»


ANSWER :1 sq unit 7 .X -y=0
11546.

Find the sum of all four digit numbers formed by the digits {1,2,3,….9} in which exactly two digits are prime and repetition of digits is not allowed

Answer»


Answer :`1111 [2+3+5+7^(3) C_(1). ""^(5)C_(2). 3! + (1+4+6+8+9) ""^(3)C_(2). ""^(5)C_(1).3!]`
11547.

Solve : (i) |x^(2)-2x|le x , (ii) (x^(2)-9)(|x|-2)le0

Answer»


Answer :(i) `[1,3] UU {0}`
(ii) `[-3,-2]uu[2,3]`
11548.

Integrate the function in Exercise. ((x-3)e^(x))/((x-1)^(3))

Answer»


Answer :`I=(1)/((X-1)^(2))+E^(x)+C`
11549.

Find the polynomial P(x) of the least degree whose graph has three points of inflection : (-1,-1),(1,1)and a point withabscissa 0 at whichthe curve is inclined to the axisof abscissas at an angle of 60^(@).

Answer»


ANSWER :`X SQRT(3)`
11550.

Let A, B be two 3xx3 matrices with entries from real number . Which one of the follwing is true ?

Answer»

`(A+B)^(3)=A^(3) +3A^(2) B+3AB^(2)+B^(3)`
`(AB)^(2)=O IMPLIES AB=O `
`(A+B)(A-B)=A^(2)-B^(2)`
`(A+B) A=BA+A^(2)`

ANSWER :D