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We would be talking about the sum of this arithmetic series:
1,2,3,4,5,...n-1, n

Can you show me step by step how to solve this

http://www.trans4mind.com/personal_development/mathematics/series/sumNaturalNumbers.htm

natural number sequence is
1, 2, 3, 4, 5,///
notice that "0" is not a natural number

can you explain how you came up with the formula