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4. Predict the coefficient of the required term

Write the coefficient of

r^{3}

in each of the following:

(i)

{19 r}^{3} {+ r}^{2} - 10

The coefficient of '

r^{3}

' is

\(1\)
19
\(-10\)

(ii)

\sqrt{19} r^{3} - \frac{π}{2} r^{2} + r

\(=\)

$r^{3}$
$\sqrt{19}$
$\frac{π}{2}$

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