The sum of the coefficients in the expansion of $(1 + x - 3 x^{2})^{171}$ is

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-1

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Solution

The correct option is B -1
Given expression is $(1 + x - 3 x^{2})^{171}$
Substituting $x = 1$ in the above expression, we get the sum of the binomial coefficients as
$(1 + x - 3 x^{2})^{171}$
$= (1 + 1 - 3)^{171}$ (substituting $x = 1$ )
$= (- 1)^{171}$
$= - 1$
Hence answer is C

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