summation series

Question

what is the summation of this series?

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

Comments

$(1+2)^n = \binom{n}{0}1^n2^0 + \binom{n}{1}1^{n-1}2^1 + ... \binom{n}{n}1^02^n$

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@air1 thanks...u have solved gate 1987 question this way

https://gateoverflow.in/82446/gate1987-9e