$$3p^{2}.6pq.9q^{2}=$$
$\frac{81\left(pq\right)^{3}}{50}$
$$3p^{3}\times 0.6q\times 0.9q^{2}$$
$$3p^{3}\times 0.6q^{3}\times 0.9$$
$$1.8p^{3}q^{3}\times 0.9$$
$$1.62p^{3}q^{3}$$
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$\frac{243p^{2}q^{3}}{50}$
