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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 :
- (a)$2a^2b^2$
- (b)$180 a^2b^2$
- (c)$12 a^2b^2$
- (d)$180 a^3b^4$
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Sol. (d) $180 a^3b^4$