The sum of coefficients in the polynomial expansion of $(1 + x - 3 x^{2})^{2163}$ is

1

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- 1

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0

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none of these

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Solution

The correct option is A $- 1$
For sum of the coefficients, we substitute $x = 1$
Hence
$(1 + x - 3 x^{2})_{x = 1}^{2163}$
$= (2 - 3)^{2163}$
$= - 1$
Hence the required answer is $- 1$

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