Question

sn=n/2{2a+(n-1)d} explain.​

Answer 1

Answer:

Heyaa♡♡

The given Formula is used for finding the sum of nth term of an A. P.

Here, a = first term.

n = no. of terms

d = common difference.

Hope it helped you.

Answer 2

Answer:

Step-by-step explanation:

Sn = n/2(a+an)

=n/2(a+[a+(n-1)d])

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

Hope it helps you!