Home
Class 10
MATHS
In the formula a(n) = 3.6, a = - 18.9, d...

In the formula `a_(n) = 3.6, a = - 18.9, d = 2.5, n = ……………

A

13

B

12

C

10

D

20

Text Solution

Verified by Experts

Promotional Banner

Topper's Solved these Questions

  • PROGRESSIONS

    VGS PUBLICATION-BRILLIANT|Exercise Creative Bits for CCE Model Examination|129 Videos

  • PROBABILITY (MULTIPLE CHOICE QUESTION)

    VGS PUBLICATION-BRILLIANT|Exercise PROBABILITY (MULTIPLE CHOICE QUESTION)|20 Videos

  • PROGRESSIONS (MULTIPLE CHOICE QUESTION)

    VGS PUBLICATION-BRILLIANT|Exercise PROGRESSIONS (MULTIPLE CHOICE QUESTION)|20 Videos

Similar Questions

Explore conceptually related problems

a_(n) = 9-5n, a_(4) = ………….

a_(n) = 2^(n), a_(5) = ………

If the general solution of sin 5x = cos 2x is of the form a_(n),(pi)/(2)" or "n=0, pm 1, pm2,....," then "a_(n)=

a_(n) = n/(n+2) , a_(3) = ……….

Explain the terms in the formula. S_(n) = n/2 [2a+(n-1)d] .

5/2, 5/4, 5/8, ………… a_(n) = …………….

In an AP: (i) Given a=5, d=3, a_(n) = 50 , find n and S_(n) (ii) given a=7, a_(13) = 35 , find d and S_(13) . (iii) given a_(12) = 37, d=3 , find a and S_(12) (iv) given a_(3) = 15, S_(10) = 125 , find d and a_(10) (v) given a=2, d= 8, S_(n) = 90 , find n and a_(n) (vi) given a_(n) = 4, d=2, S_(n) = - 14 , find n and a. (vii) given l=28, S= 144, and there are total 9 terms, find a.

In a series a_(n) = (n(n+1))/(3), a_(2) = ………….

In an AP a_(n) = (5n-3)/(4) , then a_(7) = ………..

In an AP: (vi) Given a_(n) = 4, d = 2, S_(n) = -14 , find n and a.