If two positive integers $p$ and $q$ can be expressed as $p = 18\,a^2b^4$ and $q = 20\,a^3b^2$, where $a$ and $b$ are prime numbers, then LCM $(p, q)$ is:

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Step 1: $p = 18\,a^2b^4 = 2 	imes 3^2 	imes a^2 	imes b^4$, $q = 20\,a^3b^2 = 2^2 	imes 5 	imes a^3 	imes b^2$
LCM $= 2^2 	imes 3^2 	imes 5 	imes a^3 	imes b^4 = 180\,a^3b^4$

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