1.

Using the result of the preceding problem obtain the following formula : 1 - (C_(n)^(1))/(3) + (C_(n)^(2))/(5) - (C_(n)^(3))/(7) + . . . . . + (-1)^(n) (C_(n)^(n))/(2 n + 1) = ((2n)!!)/((2n + 1)!!),where C_(n)^(k)are binomial coefficients.

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