Question

Formula for finding the sum of an arithmetic progression

Answer 1

Sn=n/2{2a+(n-1)d}

I hope it helps uu

Answer 2

Answer:

Step-by-step explanation:

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

Or when An is given then

Sn=n/2(a+An)

Where An is the last term