First slide

Multinomial expansion

Question

$The sum of the coefficients of {(1 + 2 x - 4 x^{2})}^{35} is$

Easy

A

0
B

1
C

-1
D

2

Solution

$By taking x=1, we get sum of the coefficients = (1 + 2 - 4)^{35} = (- 1)^{35} = - 1$

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