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

`sum_(i=1) ^(20) ( (^ 20 C_(i-1)) / (^ 20 C_i + ^ 20 C_(i-1)) )^3` then find the value of k. (a) 400 (b) 100 (c) 50 (d) 200

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