Question: how many integers from 1 to 100 are multiples of 3 or 5 but not both?
Answer: I will assume that we will eliminate integers that are multiples of BOTH 3 & 5, leaving just integers that are multiples of 3 & 5, but not both. The answer is 41. There are 47 integers that are multiples of 3 or 5 or both.