Question

how is s3-s2=a3 ??
(Chapter-A.P.)​

Answer 1

Answer:

s3=a1+a2+a3

s2=a1+a2

Therefore,

s3-s2=

a1+a2+a3-a1-a2=a3

PLS MARK IT BRAINLIEST!

Answer 2

Use formula of Sum of n terms.

Then, just simply subtract the two Equations.