The value of Sigma(i=1)^(n) Sigma(j=1)^(...

The value of `Sigma_(i=1)^(n) Sigma_(j=1)^(i) underset(k=1)overset(j)` =220, then the value of n equals

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Verified by Experts

The correct Answer is:

The sum equals `(n(n+1)(n+2))/6=220`
Which is true for n=10

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