The coefficient of $x^{3}$ in the polynomial $5 + 2 x + 3 x^{2} - 7 x^{3}$ is:

5

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2

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7

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- 7

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Solution

The correct option is D $- 7$
Clearly $- 7$ is the constant multiplied with $x^{3}$ .
Hence, coefficient of $x^{3}$ is $- 7.$

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