Question

In an A.P
1) given, a=2, d=8, Sn=90, find 'n' and 'an'​

Answer 1

Answer:

$n = \frac{9}{2}$

$a_{n} = 30$

Solution is given on Image.

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Answer 2

Answer:

Sn = (n/2)(2a+(n-1)d)  

90 = (n/2)(4+(n-1)8)  

180 = n(8n-4)  

180 = 8n^2-4n  

8n^2-4n-180 = 0  

n=5  

An = 2+4*8=34