Posted by **Karina** on Monday, April 1, 2013 at 6:44pm.

Consider making a four-digit I.D. number using the digits 3,5,8, and 0

a. How many I.D. numbers can be formed using each digit once?

b. How many can be formed using each digit once and not using 0 first?

c. How many can be formed if repetition is allowed and any digit can be first?

d. How many can be formed if repetition is allowed but 0 is not used first?

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