The sum of the coefficients in the expansion of
$(1 + x - 3 x^{2})^{2143}$ is

3^{2143}

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1

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- 1

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(- 2)^{2143}

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Solution

The correct option is B $- 1$
Substituting $x = 1$ in the above expression we get the sum of the binomial coefficients as
$(1 + x - 3 x^{2})^{2143}$
$= (1 + 1 - 3)^{2143}$ (substituting $x = 1$ )
$= (- 1)^{2143}$
$= - 1$
Hence answer is C

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