54. How many integers between, but not including, 20 and 30 have a prime factorization with exactly 3 factors that are NOT necessarily unique?

(Note: 1 is NOT a prime number.)

Answer and Explanation

Your Answer is

Correct Answer is G

Explanation

There are two numbers between 20 and 30 that have only 3 factors that may be the same. The first number is 27, and three factors are all 3; the second number is 28, and three factors are 2. 2, 7.