Question

what is sum of ap series ?​

Answer 1

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

Or

Sn = n /2 (a + an)

Answer 2

Answer:

The sum of A.P. series is

S n = n/2 { 2a ( n -1) d }

or

S n = n/2 ( a + a n )

or

S n = n/2 ( a + l )

l hope it'll help you