1.

Given a=2 ,d=8, Sn=90, find a= ? and A9​

Answer» ONG>Step-by-step explanation:

Here,

Given :

a = 2

d = 8

sn = 90

So,

According to formula ,

Sn = a + ( 2d - a)d = A9

90 = 2 + ( 16 - 2) 8

90 = 2 + 128 - 16

90 = 130 -16

90A9= 114

A9 = 114/90



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