Question

write the foomula for the
sum of 'n' terms​

Answer 1

Answer:

hope it helps u

Step-by-step explanation:

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

sn=n/2(a+l)

2nd formula applicable when last term is given

Answer 2

Answer:

sum of 'n' terms =

$\frac{n}{2}(2a + (n - 1)d)$

where, a = first term

d = common difference

n = number of terms