Answer:
{2, 3, 7}
Step-by-step explanation:
Actually there are several pairs of integers whose product is 42:
1*42, 2*21, 3*14, 6*7.
Some of these factors are themselves factorable.
For example: 42 = 2*21 = 2*3*7, plus the obvious factor 1, are the unique factors of 42.
