Posted by **sha** on Tuesday, July 27, 2010 at 10:17pm.

you are to set up a code of consisting of three letters (A to Z) and five numbers (0 to 9).

a) how many codes are possible if the letters and numbers can be repeated?

b) how many codes are possible if each letter and digit can be only used once?

c) how many codes are possible if each code begins with an A and if the digits cannot be repeated?

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