Divide the monomials $15 a^{3}$ by $5 a^{2}$

\frac{3}{a}

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3 a

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\frac{1}{3 a}

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3 a^{2}

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Solution

The correct option is D $3 a$
$15 a^{3} \div 5 a^{2} = \frac{15 a^{3}}{5 a^{2}}$

$= 3 \times \frac{a^{3}}{a^{2}} = 3 \times a^{3 - 2}$

$= 3 a$

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