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[sum(i=1)^(20)((20)/(20)C(1)+^(20)C(i-1)...

[sum_(i=1)^(20)((20)/(20)C_(1)+^(20)C_(i-1))^(3)=(k)/(21)," then "k" equals : "],[[" (1) "200," (2) "50," (3) "100," (4) "400]]

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