Sum of first n natural number

1.	Sum of first n natural number
Answer» of FIRST N Natural NUMBERS. We prove the formula 1+ 2+ ... + n = n(n+1) / 2, for n a natural number. There is a simple applet showing the ESSENCE of the inductive proof of this RESULT.

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of FIRST N Natural NUMBERS. We prove the formula 1+ 2+ ... + n = n(n+1) / 2, for n a natural number. There is a simple applet showing the ESSENCE of the inductive proof of this RESULT.

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Sum of first n natural number​

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Sum of first n natural number