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20. An employee identification code for a hospital consists of 2 letters from the set {A, B, C, D} followed by 4 digits. a. How many identification codes are possible if both letters and digits may be repeated? b. How many identification codes are possible if letters and digits may not be repeated?

20. An employee identification code for a hospital consists of 2 letters from the set {A, B, C, D} followed by 4 digits. a. How many identification codes are possible if both letters and digits may be repeated? b. How many identification codes are possible if letters and digits may not be repeated?

College Algebra
College Algebra
1st Edition
ISBN:9781938168383
Author:Jay Abramson
Publisher:Jay Abramson
Chapter9: Sequences, Probability And Counting Theory
Section9.5: Counting Principles
Problem 36SE: The number of 5-element subsets from a set containing n elements is equal to the number of 6-element...
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20. An employee identification code for a hospital consists of 2 letters from the set {A, B, C, D} followed by 4 digits. a. How many identification codes are possible if both letters and digits may be repeated? b. How many identification codes are possible if letters and digits may not be repeated?
Transcribed Image Text:20. An employee identification code for a hospital consists of 2 letters from the set {A, B, C, D} followed by 4 digits. a. How many identification codes are possible if both letters and digits may be repeated? b. How many identification codes are possible if letters and digits may not be repeated?
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