Question

In an A.P if the first term (a) and common differences (d) are given then Sn=​

Answer 1

Answer:

Sn=n/2(a+(n-1)d) is Sn formula when first term is a and common difference is d

Answer 2

$\sf S_n = \frac{n}{2} ({ \: \: 2a + (n - 1)d \: \: })$