Find the order of $G=C_3 \times \mathbb{Z}_5 \times S_4$.

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Find the order of $G=C_3 \times \mathbb{Z}_5 \times S_4 $.

Am I correct in thinking that you simply multiply the order of each component? This would give $|G|=3*5*24=360$

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The order of $G\times H$ is $|G|\|H|$, this is simply because the set of elements of $G\times H$ is the set of ordered pairs $(g,h)$.

Maybe you are confusing external direct product with internal product of subgroups in which the order of $GH$ is $\frac{|G||H|}{|G\cap H|}$. But this is in a different setting.