Question: how many odd prime numbers from 1 to 100?
Answer: So we already have the list of prime numbers between 1 and 100: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89 and 97. All these prime numbers are odd, except for number 2. If we remove the number 2, those that remain are the answer to the question.