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If underset(i=1)overset(20)Sigma((.^(20)...

If `underset(i=1)overset(20)Sigma((.^(20)C_(i-1))/(.^(20)C_(i)+.^(20)C_(i-1)))^(3)=(k)/(21)`, then k equals

A

50

B

400

C

200

D

100

Text Solution

Verified by Experts

The correct Answer is:
D
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