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in Algebra by (53.3k points)

Find the value of the expression

 \(\sum\limits_{i =1}^n\sum\limits_{j =1}^i\sum\limits_{k =1}^j1\)

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1 Answer

+1 vote
by (53.5k points)

Correct answer is \(\frac{n(n + 1)(n + 2)}6\).

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