Predict the coefficient of the required term — task. Mathematics State Board, Class 9.

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Write the coefficient of

r^{3}

in each of the following:

(i)

{13 r}^{3} {+ r}^{2} - 9

The coefficient of '

r^{3}

' is .

(ii)

\sqrt{13} r^{3} - \frac{π}{2} r^{2} + r

$=$

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7. Predict the coefficient of the required term