If n is the product of the integers from 1 to 9, inclusive, how many different prime factors greater than 1 does n have?
Select
A) Four  B) Five  C) Six  D) Seven  E) Eight
n = 1*2*3*4*5*6*7*8*9   The prime factors of n are 2, 3, 5, and 7.   There are 4 prime factors.   The answer is Four.
<result>A</result>
If n is the product of the integers from 1 to 9, inclusive, how many different prime factors greater than 1 does n have?