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

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Solution

The correct option is C $- 1$
For sum of coefficients,

Let $x = 1$ in $(1 + x - 3 x^{2})^{171}$

sum $= (1 + 1 - 3)^{171} = (- 1)^{171} = - 1$ .

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