[" 12.The sum,"sum(n=1)^(7)(n(n+1)(2n+1)...

[" 12.The sum,"sum_(n=1)^(7)(n(n+1)(2n+1))/(4)" is cqual to "],[" (a) "320],[" (b) "400],[" (c) "504],[" (d) "604]

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