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

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

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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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If 20C_(r+1)=^20C_(r-1) , then r is equal to: