2x2x2x3x3.
http://wiki.answers.com/Q/What_are_the_prime_facto...

The prime factorization for 72 is 2 * 2 * 2 * 3 * 3 Keep on doing the ChaCha! .
http://www.chacha.com/question/whatistheprimef...

The expression 2*2*2*3*3 is said to be the prime factorization of 72. Ask us 24/7!
http://www.kgbanswers.com/whatistheprimefactor...

random sample means there are no determining factors. there is no pattern of selection, nothing to help in selection.
http://answers.yahoo.com/question/index?qid=200905...
