please use python 3 or higher

1. Note: You must use only accumulative recursion for this question Write a Python function calc_exp that consumes three positive natural numbers a, b and n, and returns the result of (b+b2+b3+.. .+b?) + (a+1) (a+2).. . (atn) For example, calc exp (10,10,1) => 21 calcexp (10,3,4) => 24144 , because 3+32+33+3 (10+1) (10+2) (10+3) (10+4)-24144