Question

Find thesum of first n terms pf apwhose nth term is 5n-1

Answer 1

Answer:

Step-by-step explanation

$a_{n}$ = 5n-1

$s_{n}$ = $\frac{n}{2}$ (a+$a_{n}$)

Sn=n/2*(5-1+5n-1).

=n/2*(4+5n-1)

=n/2*(5n+3)

=$5n^{2}$+3n/2

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REGARDS:)

ROHAN DHEERAJ