Answer:
4/100 or 1/25
Step-by-step explanation:
There are 100/3 ≈ 33 numbers that are divisible by 3
There are 100/7 ≈ 14 numbers that are divisible by 7
However, 21, 42, 63, and 84 are divisible by both 3 and 7.
This means that that the chance you will select a number between 1 and 100 that is divisible by 3 and 7 is 4/100 or 1/25