Question

In an ap if the first term is 22, the common difference is 4 and the sum to n terms is 64, then find n.

Answer 1

Step-by-step explanation:

Data: a=22,d=4,Sn=64n=?

Here we have to use the Sn formula

ie. Sn=n\2 (2a+(n-1) D

64=n/2 ×2(22) + (n-1) 4

64= n/2 × 44 + 4n -4

64= 44n/2+ 4n -4

128= 44n -4

132/44=n

n= 3

Hope it helps u