Question
Write in terms of factorials
$3 \times 6 \times 9 \times 12 \times 15$

Answer

$3 \times 6 \times 9 \times 12 \times 15$
$=3 \times(3 \times 2) \times(3 \times 3) \times(3 \times 4) \times(3 \times 5)$
$=\left(3^5\right)(5 \times 4 \times 3 \times 2 \times 1)$
$=3^5(5 !)$

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