$$3( \frac{ { a }^{ 2 } }{ 4 } )( \frac{ 2b }{ 3 } )$$
$\frac{ba^{2}}{2}$
$$\frac{3a^{2}}{4}\times \frac{2b}{3}$$
$$\frac{3a^{2}\times 2b}{4\times 3}$$
$$\frac{ba^{2}}{2}$$
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$ab$