ap

If the sum of n terms of a series is Sn = n (5n â€“ 3), find the nth term and pth term.

2 Answers

series is AP since sum is a 2Â° eqn

find first term by finding S1 , find common difference by using S2 - S1

and then use Tn = a+ (n-1)d

are u trying them ?? or just copying ur assignments here ??
or is it dat ur id is fake?

Sn = n(5n-3)

Sn = n/2 (10n - 6)

comparing with Sn = n/2 ( 2a + (n-1)d)

d = 10
2a-d = -6
therefore a = 4/2 = 2

hence find nth and pth term

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