If then k equals........................| Binomial Theorem

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JEE Main 2019

10-01-2019 S1

Question

If $\sum_{\mathrm{i}=1}^{20}\left(\frac{{ }^{20} \mathrm{C}_{\mathrm{i}-1}}{{ }^{20} \mathrm{C}_{\mathrm{i}}+{ }^{20} \mathrm{C}_{\mathrm{i}-1}}\right)^3=\frac{\mathrm{k}}{21}$, then k equals

Select the correct option:

A

400

B

100

C

200

D

50

✓ Correct! Well done.

✗ Incorrect. Try again or view the solution.

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