The value of the sum ${C_1} + 2{C_2} + 3{C_3} + 4{C_4} + .... + n{C_n}$ is equal to:
- A${2^n}$
- B$n \cdot 2^n$
- C$n \cdot 2^{n-1}$
- D$n \cdot 2^{n+1}$
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