Question

the formula to find sum of n th term of An ap is​

Answer 1

Step-by-step explanation:

An =a1 +(n-1)d

A1= First term

N=no of term

D=Common difference

Answer 2

Step-by-step explanation:

The formula to find sum of n th term of an A.P is,

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