Question

The sum of the first natural number and 0 is 1, the sum of the first two natural numbers and 0 is 3, the sum of the first three natural numbers and 0 is 6, and the sum of the first four natural numbers and 0 is 10. Which explicit formula generates the sum of the first n natural numbers and 0?

Answer 1

A

Explanation:

Answer 2

the sum of the first n natural numbers and 0=
n*(n+1)/2