Is 42 and 105 relatively

prime

No.

Step-by-step explanation:

42 has the following prime factors: 2, 3, 7

105 has prime factors: 3, 5, 7

Both prime factors 3 and 7 divide 42 and 105. If 42 and 105 were relatively prime (co-prime), the set of prime factors that divide both would be empty.