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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 1401. |
Can i have a video of sets which explains me full chapter in a manner |
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Answer» YouTube pe available hai... Search on YouTube.... |
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| 1402. |
If z=x+iy is any complex number then /z/=4, represent a |
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| 1403. |
Find the sum of n terms of sereis 5+11+19.... |
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Answer» Go to google Brainly.inWhat is your question?Secondary School Math 6 pointsFind the sum to n terms of series: 5+11+19+29+41.............It is G.P of 11th Std not A.P.Ask for details Follow Report by Rajendrapatel25 27.10.2018Answerspreetam98preetam98 AmbitiousN(n+1)(2n+1/3+1)-1n(n+1)(2n+4)/6-13.630 votesTHANKS 35Comments (1) ReportThank you so much Log in to add a commentpr264428 AmbitiousAnswer:\\frac{n(n+1)(2n+4)}{6}-1Step-by-step explanation:In the given series,We have the series,5 + 11 + 19 + 29 + 41 + .................So,We can simply write it as,5 + 11 + 19 + 29 + 41 + ................. = (2² + 1) + (3² + 2) + (4² + 3) + (5² + 4) + ............On rearranging, we get,= (2² + 3² + 4² + 5² +.......) + (1 + 2 + 3 + ........)Now, we know that sum of squares of first \'n\' terms is given by,Sum=\\frac{n(n+1)(2n+1)}{6}So,We can write the first part as,2^{2} + 3^{2} + 4^{2} + 5^{2} +.......=\\frac{n(n+1)(2n+1)}{6}-1also,Sum of the second half is given by,Sum=\\frac{n}{2}(2a+(n-1)d)\\\\Sum=\\frac{n}{2}(2+(n-1))=\\frac{n}{2}(n+1)Therefore, the total sum of the \'n\' terms is given by,Sum=(\\frac{n(n+1)(2n+1)}{6}-1)+\\frac{n}{2}(n+1)\\\\Sum=\\frac{n}{2}(n+1)\\left[\\frac{2n+1}{3}+1\\right]-1\\\\Sum=\\frac{n(n+1)(2n+4)}{6}-1Therefore, the sum of the the terms is given by,Sum=\\frac{n(n+1)(2n+4)}{6}-1\\\\ |
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| 1404. |
Iim ( X^2-24X-16/X^2-2X-12)X-0 |
| Answer» Here limit is x tends to 0 so put x=0 here and you will get the answer as 4/3 | |
| 1405. |
1/9 part of right angle |
| Answer» First convert 90 degree to radian and divide it by 9 so answer will be like (90*(180/π))/9=1800/π | |
| 1406. |
15.1 question no 11 and12 |
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| 1407. |
1+1+1+1+23 |
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Answer» 27 27 27 |
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| 1408. |
2×2+2 |
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Answer» 6 6Applying BoDmas 6 |
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| 1409. |
What is domain and codomain in set? |
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| 1410. |
Insert 6 numbers between 3 and 24 such that the resulting sequence is an A.P |
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Answer» U can start by Letting 6 no. Be A1,A2,A3,A4,A5,A6 between 3&24.So here,a=3 , b=24, n=8So,l=an 24=3+(8-1)dD=3A1=a+d=3+3=6.A2=a+2d=3+2*3=9Similar A3,A4,A5 and A6 will be 12,15,18 and 21.So, resulting series will be 3,6,9,12,15,18 and 21. #ANS Sorry....you would take n=8 ( including 3 and 24) You are given a=3An=24N=6Use an = a+(n-1)dFind d and put the no. Accordingly |
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| 1411. |
Sinx -sinx divided by x cube |
| Answer» What..? | |
| 1412. |
If a wheel make 120 revolution in one second through how many radians does it turn in one second |
| Answer» No.of revolution in one minute:360So in one second:360/60=6In one revolution wheel turns:2 pie radianIn 6 complete revolution it turns:6*2pie....=12pie | |
| 1413. |
Prove that n-1Pr + rx n-1Pr-1=nPr |
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| 1414. |
Write the relation between standard deviation and variance. |
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| 1415. |
Two lines are parallel if and only if their |
| Answer» Slopes are equal | |
| 1416. |
Solve the equation x(x+1)2 (x+2) |
| Answer» =(x²+x)(2x+4)=2x³+6x²+4x=x²+3x+2 | |
| 1417. |
Formulas ch 1 |
| Answer» No important formulaOnly properties and all paragraph questions in ncert can be solve by vienn\'s diagram No need to learn any formulae only understand the concept of vienn\'s diagramThanks | |
| 1418. |
1^2+3^2+5^2+-----+(2n-1)^2=n(2n-1)(2n+1)/3 |
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Answer» L.H.S.Sum=1^2+2^2+---------+(2n-1)^2=sum(2n-1)^2=sum(4n^2+1-4n)=sum4n^2+sum(1)-sum(4n)=4[n(n+1)(2n+1)/6]+n-4n(n+1)/2=n/3[2(n+1)(2n+1)+3-6(n+1)]=n/3[4n^2+6n+2+3-6n-6]=n/3[4n^2-1]=n/3[(2n-1)(2n+1)]=n(2n-1)(2n+1)/3 Bhai rehne de |
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| 1419. |
How can be find that in a question -permutation use or combination |
| Answer» If order matters its permutation if not then its combination | |
| 1420. |
Find the value of p for which 8 power of p +2 power of -3 = 2 power of9 |
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| 1421. |
Solve x+y_4,x+5y>_5,x |
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| 1422. |
If a square + b square = 1, find the value of 1+b+ia/1+b-ia |
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| 1423. |
(-5i)(1/8i) from a+bi |
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| 1424. |
Class 11 maths ncert exercise 8.1 question 13 |
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| 1425. |
Find polar form of -1+¡ |
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| 1426. |
Solve root 5x ^2 + x + root 5 = 0 |
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| 1427. |
Why mathematician is fail to explain the solution of 0/0. |
| Answer» I don\'t know .............................. | |
| 1428. |
If Cos A 4 by 5 and a lie in a fourth quadrant find the value of Sin A + tan a |
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| 1429. |
Sin(x) +sin(y) |
| Answer» 2sin(x+y/2).cos(x-y/2) | |
| 1430. |
What is ths formula of sin(x) +din(y) |
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| 1431. |
What is a function |
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Answer» A function f from a set A to a set B is a specific type of relation for which every element x of set A has one and only one image y in set B. So we can write f: A----->B, where f(x)=y. A function is a special type of relation in which every pre-image has its unique image. |
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| 1432. |
All Trigonometry formula |
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Answer» Dont forgot the motive of this app tere baap se jake puch Pagal hai |
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| 1433. |
Value of x such that the points (x,3), (-2,1) and (4,5) are collinear is??Options: -8, -6, 6, 4 |
| Answer» 1 hoga answer | |
| 1434. |
Prove that sin^2x+sin^2(x+2π/3)+sin^2(x-2π/3)=3/2 |
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| 1435. |
Find the mean and standard deviation of first 200 natural numbers |
| Answer» Mean is 1 | |
| 1436. |
If in a triangle ABC , angle B=60digeri and b:c=5:42 find angleA |
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| 1437. |
find the value of sin 18 |
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Answer» -1+- √5 /4 Sin 180 - ° Riya msg me on WhatsApp 8076444523 i will send u a sol..... |
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| 1438. |
3. Find a if the coefficient of x2 and x3in the expansion of are equal |
| Answer» Where is the expansion | |
| 1439. |
Variance of first n numbers |
| Answer» 54555/8655 | |
| 1440. |
Evaluate 3½×3¼×3⅛..... |
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Answer» 3^1/2+1/4+1/8+................=3^1/2/1-1/2=3 3^1/2+1/4+1/8+-------3^[1/2(1/2^n-1)/(1/2-1)]=3^[1/2(1/2^n-1)/(-1/2)]=3^[-(1/2^n-1)]=3^(1-1/2^n) |
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| 1441. |
Show that the sum of (m+n)th and (m-n)th terms of an AP is equal twice to mth term |
| Answer» (m+n)th term is a+(m+n-1)d and (m-n)th term is a+(m-n-1)d and mth term is a+(m-1)d .now add both of them a+(m+n-1)d+a+(m-n-1)d =2 (a+(m-1)d) | |
| 1442. |
If alpha and bita are different complex numbers with | bita| =1 , then find |bita-alpha/1-alphabita| |
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| 1443. |
D/dx. Of e raise to power x |
| Answer» Same e raise to power x | |
| 1444. |
Find the derivatives of √sin x |
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Answer» Cosx divided by 2 root sinx / cos x |
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| 1445. |
Lim 1 - cos2mx / 1- cos 2nxx→0 |
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Answer» m^2 / n^2 Limit kitni h |
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| 1446. |
how many 4 digital number are there with no digit repeated |
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Answer» Total 4 digit no - number beginning with 0= 5040-504 5040 |
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| 1447. |
Sin alpha-sin bita by cos bita-cos alpha =? |
| Answer» tan alpha+bita /2 | |
| 1448. |
If z is a complex number having least absolute value and l z-2+2i l=1, then z=? |
| Answer» Z=3 or z= 1 | |
| 1449. |
The first term of GP is 1 .the sum ofthe third and fifth term is 90. Find the common ratio of GP |
| Answer» Let first term be a = 1; and common ratio = d;Then, ad² + a d^{4} = 90=> d4 + d² - 90 = 0=> d4 + 10d² - 9d² - 90 = 0=> (d² - 9) (d² + 10) = 0=> d² = 9 {Neglecting -10}=> d = ±3 Hence, the common ratio is ±3..... | |
| 1450. |
Ap ex 2.3 11question |
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