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The sum ∑(n(n + 1)(2n + 1))/4 for n [n=1, 7] is equal to ________.

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The sum ∑(n(n + 1)(2n + 1))/4 for n [n=1, 7] is equal to ________.

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= 392 + 105  7 = 504

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 = 1/4(2((7 x 8)/2)2 + 3((7 x 8 x 15)/6) + (7 x 8)/2)

= 504

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∑(n(n + 1)(2n + 1))/4 for n ∈ [n=1, 7] is equal to
asked Jan 12, 2020 in Mathematics by AmanYadav (54.9k points)

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