In $- 9 a b^{2} c^{3}$ , write down the coefficient of:
$- b^{2}$

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Solution

We have to find the coefficients of $- b^{2}$ in $- 9 a b^{2} c^{3}$
i.e- $- 9 a b^{2} c^{3} = - b^{2} \times (9 a c^{3})$
Hence, the coefficients of $- b^{2}$ in $- 9 a b^{2} c^{3}$ is $9 a c^{3}$

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