Theory

Recursive summation

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Write a recursive function rec_sum() that takes some natural number n as its input and outputs the sum of first n natural numbers.

This problem is very similar to that of finding a factorial, so we are sure that you'll be able to get it right!

Sample Input 1: 

1

Sample Output 1: 

1
Write a program in Python 3
def rec_sum(n):
# write the insides here!
return
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