[JEE Advanced 1986] [Source incomplete] With $C_r=\binom nr$ and $n$ an even positive integer, the sum of the series $\dots$ (the series itself was not captured) equals ____
[Source incomplete] With $C_r=\binom nr$ and $n$ an even positive integer, the sum of the series $\dots$ (the series itself was not captured) equals ____
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