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Q.

The sum of the coefficients in the expansion of (1+5x−7x3)3165 is

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a

1

b

23165

c

23164

d

-1

answer is D.

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Detailed Solution

Putting x=1 in (1+5x−7x3)3165, the required sum of coefficients = (1 + 5 – 7)3165 = (– 1)3165 = –1.
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