Find the coefficient of $y^{2}$ in the following algebraic expressions :
$9 y^{3} - 12 y^{2} + 9 y$

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Solution

Find the coefficient of $y^{2}$
Coefficient - A coefficient is a numerical value that is multiplied by a variable.
As $y^{2}$ is multiplied to $- 12$ in the expression $9 y^{3} - 12 y^{2} + 9 y$ , so $- 12$ is the coefficient of $y^{2}$
Hence , the coefficient of $y^{2}$ in $9 y^{3} - 12 y^{2} + 9 y$ is $- 12$

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