Question

1+2+3+.....…+n+n(n+1)/2​

Answer 1

Solving to get the sum of the sequence is easy.

✓From 1+...+n, the sum is n(n+1)/2.

✓The last is n(n+1)/2

✓The sum is n(n+1) for any value of n except n= 0.

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