The integers from 1 to 25 are multiplied together. How many zeros does the result end in?
(A) 2 (B) 3 (C) 4 (D) 5 (E) 6
25! = 15511210043330985984000000 actually, but you only need to find the power of 10 in the product to know how many zeros are at the end. Remember that 1,2,5, and 10 are the factors of 10 and count the number of times a multiple of ten appears in the product.