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If Σ i ∈ [i = 1, 20] (20Ci-1/20C1 + 20Ci-1)^3 = k/21, then k equals

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If Σ i ∈ [i = 1, 20] (20Ci-1/20C1 + 20Ci-1)3 = k/21, then k equals

(1) 400 

(2) 50 

(3) 200 

(4) 100

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Correct option: (4) 100

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Correct option: (4) 100

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