How many positive divisors of 30! are prime?
I know that 30! means the product of all the positive integers from 1 to 30. So any prime divisor of 30! must be one of the prime numbers between 1 and 30. I can list those: 2, 3, 5, 7, 11, 13, 17, 19, 23, and 29. There are 10 of them, so that's my answer.

