Question

If the sum of first 5 terms of an AP is 25 and that of 19 terms is 361, find the sum

of first n terms.​

Answer 1

Answer:

very easy

Step-by-step explanation:

gjhh kvhg nhg ncgf nhhg jhggh ghygd high gghcy fhfvrh vhf

Answer 2

Answer:

S

8

=64

S

n

=

2

n

(2a+(n−1)d)

2a+7d=16

S

19

=361

2a+18d=38

Solving, a=1,d=2

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