How many four-letter code words are possible using the letters in IOWA if, (a)The letters may not be repeated? (b)The letters may be repeated?

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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How many four-letter code words are possible using the letters in IOWA if,

(a)The letters may not be repeated?

(b)The letters may be repeated?

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