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Question: The sum of the coefficient in the expansion of (1 + 5x – 7x<sup>3</sup>)<sup>3165</sup> is –...

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

A

1

B

23165

C

23164

D

–1

Answer

–1

Explanation

Solution

For sum of coefficient,

put x = 1, (1+5–7)3165 = (–1)3165 = –1