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summation series

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what is the summation of this series?

S=nC0*20+nC1*21+nC2*22+..............nCn*2n

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NIELIT 2021 Dec Scientist A - Section B: 59
Let $\text{C} (n, \; r) = \binom{n}{r}.$ The value of $ \displaystyle \sum_{k=0}^{20}(2k+1) \text{C} (41, 2k+1),$ is :$40 (2)^{40}$$40 (2)^{39}$$41 (2)^{40}$$41 (2)^{39}$