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The value of 1.C1+3.C3+5.C5+7.C7+.........

The value of `1.C_1+3.C_3+5.C_5+7.C_7+.......,` where `C_0, C_1, C_2, ........C_n`, are the binomial coefficients in the expansion of `(1 + x)^n`, is

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