An identification code is to consist of three upper case letters followed by four digits. How many

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An identification code is to consist of three upper case letters followed by four digits. How many different codes are possible if 

(a) Repetition of letters and numbers is not permitted?

(b) Repetition of letters and numbers is permitted? 

(c) Repetition of letters is permitted, repetition of numbers is not permitted, and the first three entries must all be the same letter? 

(d) The first letter must be an A, B, C, or D and repetition of letters and numbers is not permitted?

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Related Book For  book-img-for-question

A Survey of Mathematics with Applications

ISBN: 978-0134112107

10th edition

Authors: Allen R. Angel, Christine D. Abbott, Dennis Runde

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