n is a positive integer and k is the product of all integers from 1 to n inclusive. If k is a multiple of 1800, then what is the smallest possible value of n?  Choose one:
A) 8 B) 10 C) 12 D) 15 E) 18
1800=2^3*3^2*5^2   5^2 means that n must be at least 10. That is, We need 5 and 10.   The answer is 10.
<result>B</result>
n is a positive integer and k is the product of all integers from 1 to n inclusive. If k is a multiple of 1800, then what is the smallest possible value of n?