Question: a formal proof or provide a counter example: For each natural number n strictly greater than two, 1 2 + 23 + 34 + ...n(n+1)=

a formal proof or provide a counter example:

For each natural number n strictly greater than two,

1 2 + 23 + 34 + ...n(n+1)= n(n+1)(n+2)/3

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