Question: Sum the numbers from 1 to n Write a function sum _ n ( n ) that takes a positive integer n * * and

Sum the numbers from 1 to n
Write a function sum_n(n) that takes a positive integer n** and returns the sum of the numbers from 1 to n using the formula
S=n(n+1)2.
The return value should be an int, not a float .
Examples:
sum_n(3) returns 6.
Sum the numbers from 1 to n Write a function sum_n(n)

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