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" If "sum(i=1)^(2|)((20(c))/(20(c(i))+20...

" If "sum_(i=1)^(2|)((20_(c))/(20_(c_(i))+20_(c_(1))))^(3)=(k)/(21)," then "k" equals to "

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If Sigma_(i=1)^(20) ((""^(20)C_(i-1))/(""^(20)C_(i)+""^(20)C_(i-1)))^(3)=(k)/(21) , then k equals

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