1.

The coefficient of \[{{x}^{n}}\] in the polynomial\[(x+{{\,}^{n}}{{C}_{0}})(x+3.{{\,}^{n}}{{C}_{1}})(x+5.{{\,}^{n}}{{C}_{2}})...(x+{{(2n+1)}^{n}}{{C}_{n}})\] is

A. \[n{{.2}^{n}}\]
B. \[~n{{.2}^{n+1}}\]
C. \[(n+1){{.2}^{n}}\]
D. \[n{{.2}^{n}}+1\]
Answer» D. \[n{{.2}^{n}}+1\]


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