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If sum of all the coefficient of even po...

If sum of all the coefficient of even powers in `(1-x+x^(2)-x^(3)....x^(2n))(1+x^()+x^(2)....+x^(2n))` is 61 then n is equal to

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JEE MAINS PREVIOUS YEAR ENGLISH-JEE MAIN-MATHEMATICS
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