Question: how many integers between 1-100 are divisible?
Answer: there are (100/3) or 33 numbers between 1 and 100 which will be divisible by 3. Since the problem deals with numbers "between 1 and 100", I feel we should exclude both 1 and 100. Therefore, there are (99/2) or 49 numbers divisible by 2 between 1 and 100.