Question

Formula for sum in arithmetic progression

Answer 1

sn=n/2(2a+(n-1)d) or sn =n/2(a+l) ,

Answer 2

Heya !!

Here is your answer...

The formula for sum in Arithmetic Progression are :

● n/2 [ 2a + (n-1)d ]

● n/2 ( a + l ) where l is the last term.

Hope it helps.