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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? | |