Sum of Integers from 1 to n

What does the sum of integers from 1 to n mean?

Natural numbers are positive numbers starting from 1. These can be written as:

1,2,3,4,5,6,7,8,9,10......1,2,3,4,5,6,7,8,9,10......

We want to write a program that takes a particular number and sums up all the numbers from 1 up until that number.

The illustration below explains the concept to help you understand.

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