The sum of coefficients of integral p...

The sum of coefficients of integral powers of x in the binomial expansion of `(1-2sqrt(x))^(50)` is: (1) `1/2(3^(50)+1)` (2) `1/2(3^(50))` (3) `1/2(3^(50)-1)` (4) `1/2(2^(50)+1)`

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