Answer
$2 \times 3 \times 7$
Work Step by Step
$42$ is the product of $6$ and $7$ so,
$6 \times 7 = 42$ where 7 is prime and 6 is not, however $6 = 2 \times 3$ so we can write,
$2 \times 3 \times 7 = 42$ and now all the factors are prime
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