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calculate-W-n-1-i-j-n-i-j-




Question Number 64445 by mathmax by abdo last updated on 18/Jul/19
calculate  W_n =Σ_(1≤i≤j≤n)  i×j
$${calculate}\:\:{W}_{{n}} =\sum_{\mathrm{1}\leqslant{i}\leqslant{j}\leqslant{n}} \:{i}×{j} \\ $$

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