Question: how many numbers exist from 1 to 100 that are divisible by either 2 3 or 5?
Answer: All numbers except the ones below are divisible by 2 or 3. 66 numbers between 1 and 100 inclusive are either divisible by 2 or 3. 1 is not include in the count. 99÷3=33 , 99÷2=49 .