How many different zip codes can be made with the digits 0-9 if no digit is used more than once and the first digit is not 0? A zip code contains 5 digits.

A. 9 x 8 x 7 x 6 x 5 B. 9 x 9 x 8 x 7 x 7 C. 9 x 9 x 7 x 6 D. 9 x 9 x 8 x 7 x 6

D (9 9876) this is because this can happen in two different ways. First by choosing from 9 digits 5 and then in how many ways one can arrange 0 if it must not start.