Explore topic-wise InterviewSolutions in Class 11.

This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your Class 11 knowledge and support exam preparation. Choose a topic below to get started.

151.

How many terms of the AP -5,-9/2, -4, .... will give the sum 0?

Answer» -19=n<br>It is much better to use doubtnut app for clearing the doubts by video solution in hindi language<br>a is -5 ,d is 1/2 ,an is 0Here we have to find nApply the formula :an=a+(n-1)dAnd you will get your answer
152.

let A = (1,2,3), B=(3,4) and c={4,5,6} find A×(B U C)

Answer» (1,3)(1,4)(1,5)(1,6)(2,3)(2,4)(2,5)(2,6)(3,3)(3,4)(3,5)(3,6)<br>{(1,3),(1,4),(1,5),(1,6),(2,3),(2,4)(2,5),(2,6),(3,3),(3,4),(3,5),(3,6)}
153.

A={3,4} B={x belong to N ,2x -1smaller than 5} modules A×B modules colse

Answer» (1,3),(1,4),(2,3),(2,4)
154.

Convert the following binary numbers to the decimal (i) - 1110101100

Answer»
155.

cos^2a+cos^2(a+120)+cos^2(a-120)

Answer»
156.

I can\'t understand limits

Answer» Actually u have studied the same in 10th so be cool and study camly<br>Don\'t go too much deep in the concept. Just proceed step by step. Vaise bhi Newton ki batao chizon ko kon samajh paya h<br>Start meditation and yoga and control yourself . One day u will understand your limits ????
157.

write the interval {-2< x ≤ -1}

Answer» (-2,-1]
158.

n^2+n find the sum of n terms in this series

Answer»
159.

(ax)power n+b power n

Answer»
160.

What is the numarutue

Answer»
161.

Question(1 Point)???−>32\xa0(?+[?])\xa0??\xa0?????\xa0??Ltx−>32\xa0(x+[x])\xa0is\xa0equal\xa0to5252

Answer»
162.

Question(1 Point)???−>3\xa0|?|?\xa0??Ltx−>3\xa0|x|x\xa0is11

Answer»
163.

What is A union B intersection A union A\'

Answer» AUB<br>Answer is AUB
164.

1-2i/2+i+4-i/3+2i

Answer» (10-24i)/13<br>(10-24i)/13
165.

Far What Value of k are the poin ریم (2,4), (1,-3) and (3, 6) Collineas

Answer»
166.

Vartika

Answer» Vartika jha has been one of the contestant of dance plus and now she is a choreographer in super dancer chapter 4
167.

9(15*+30/45)

Answer» 9
168.

Domain of x2-1 / x2+4x-21

Answer»
169.

√3x2-√2x+3√3=0

Answer» x=5√6by 2
170.

What is centromer e

Answer» It is the part of chromosome
171.

Lim. 4x-1/2√x-1X 1/4.

Answer»
172.

Find the conjugate of the complex numbers:(i) -i√5

Answer» change this symbol iyota<br>sign change iorta<br>Conjugate of the given complex number is +i√5
173.

Find the modulus and the arguments of each complex numbers:1) z=-1-i√3

Answer» Argument of z=πby3 and modulus of z=2
174.

If ????+????÷????−???? = 3,?ℎ?? the value of ??? 4 ? ?? a) 16 / 25 b) 2/5 c) 1/5 d) 3/5

Answer» Correction : find the value of sin^4 theta
175.

Definition of set

Answer» A set is a well defined or well distinguished collection of objects .<br>A set is well-defined collection of objectsEx- ( a,e,i,o,u)<br>A set is a well defined or well distinguished collection of objects .<br>In Math, sets are a collection or aggregate of well define objects or elements.
176.

The sum of ap 2,5,8......up to 50

Answer» We use the arithmetic prgression A=2 D=5-2=3 N=50 Sn=n/2[2a+(n-1) d]S50= 50/2[2*2+(50-1)3]S50=25[4+49*3] S 50= 25*4+147S50=25*149S50= 3725 answer
177.

If f(x)=2x+5 compute f(2)-f(1/2).

Answer» f(2) = (2*2) + 5f(2) = 4+5f(2) = 9f(1/2) = (2*(1/2)) + 5f(1/2) = 1+5f(1/2) = 6f(2)-f(1/2) = 9-6f(2)-f(1/2) = 3
178.

cot 2x cotx -cot 3x cot 2x- cot3x cot2x

Answer»
179.

Calculate the value of a and b when

Answer» 3,b
180.

What is the value of tan45°.

Answer» 1<br>1<br>1<br>1<br>1
181.

Evaluate if limit tends to 0 (1+")^n-1/ x

Answer»
182.

What is the meaning of set B^c?

Answer» Bc
183.

what is the value of 1^2+2^2+3^2 __ 8^2

Answer» 204 By using the formula : n(n+1)(2n+1)/6 Above formula is derived for finding the sum of the squares of \'nth’ natural numbers.<br>204By using the formula :n(n+1)(2n+1)/6Above formula is derived for finding the sum of the squares of \'nth’ natural numbers.
184.

I+1/cos π/4+isin π/4

Answer» Write cosπ = cos 2(π/2) Then, put the identity of cos 2x=1-2 sin^2 x,Which mean, cos 2(π/2)= 1-2sin^2 π/2
185.

Chap 5

Answer» Complex number and quadratic equations
186.

F(x)= /x-1/

Answer»
187.

Covert central angle of a circle of radius 120cm subtended by an arc of length 44cm into degree

Answer» ∅=l/r, ∅=44/120 = 11/30 radian. (11/30×180/π)° take value of π=22/7, answer is 21°
188.

At what time between 9 and 10 o\'clock are the hand of a clock 23 minutes space apart

Answer»
189.

At what time between 9 and 10 o\'clock are the hands of clock 23 minute space apart

Answer»
190.

How do i get Assertion Reson Questions

Answer»
191.

sin6a ka sutra

Answer»
192.

please someone help with the solution of class math cbse lab activity no.12

Answer»
193.

X squared equals to 25

Answer» given x^2=25then, x=root 25root25=5x=5 Ans.<br>5<br>Then x=5
194.

√x²-5 Find domain&range..

Answer»
195.

Pdf on sets lesson

Answer» Problm 1
196.

Construct a straight line segment of length root 21 cm

Answer»
197.

The domain and range of the real function f defined by f(x)=(4-x)/(x-4) is

Answer»
198.

How to do sets

Answer»
199.

Sumition 13(in+in+1)=(-1+i),nbelongs to N

Answer» 26in + 2 =i<br>i= - 14/25
200.

2x+3=0

Answer» x=-3/2<br>X=-3/2<br>X=-3/2<br>X = -3/2<br>A={1,2,3,4,5,6,.....}and B={2,4,6 ,...}find AΠB?