Question

Find the sum of n terms of the series whose r^th term is (r + 2^r).

Answer 1

We need to find the sum of n terms of series whose r^th term is r + 2^r.

So, we can find the sum of the series by using summation of the nth term of the given series.

Second term in (2) is a GP, with first term a = 2, common ratio r = 2.

Sum of n terms of GP, with the first term, a, common ratio, r,