Question

If the mth term of an AP is a and its nth term is b,show that the sum of its (m+n) terms is (m+n)/2. {a+b+(a-b)/(m-n)​

Answer 1

If the mth term of an AP is a and its nth term is b,show that the sum of its (m+n) terms is (m+n)/2. {a+b+(a-b)/(m-n)