First slide

Binomial theorem for positive integral Index

Question

$The sum of the coefficients in the expansion {(1 + x - 3 x^{2})}^{70} is$

Very Easy

A

$2^{70}$
B

1
C

0
D

-1

Solution

Put x = 1
$∴ the sum of the coefficient in the expansion is (1 + 1 - 3)^{70} = (- 1)^{70} = 1$

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