2. How many 3-letter security codes can be made from the 4 letters A, B, C, D without using a letter twice? For example, BAC and ADB are two such codes. Explain.

College Algebra
1st Edition
ISBN:9781938168383
Author:Jay Abramson
Publisher:Jay Abramson
Chapter9: Sequences, Probability And Counting Theory
Section: Chapter Questions
Problem 33RE: How many ways are there to construct a 4-digit code if numbers can be repeated?
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2. How many 3-letter security codes can be made from the 4 letters A, B, C, D without
using a letter twice? For example, BAC and ADB are two such codes. Explain.
Transcribed Image Text:2. How many 3-letter security codes can be made from the 4 letters A, B, C, D without using a letter twice? For example, BAC and ADB are two such codes. Explain.
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