How many one-to-one functions are there from a set with four elements to a set with five elements? There are 120 choices for where to send the first element of the domain, 5 (b) How many one-to-one functions are there from a set with four elements to a set with three elements? 0 choices for where to send the second element of the domain, and so forth. Thus, the total number of one-to-one functions is 120 (c) How many one-to-one functions are there from a set with four elements to a set with four elements? 24 (d) How many one-to-one functions are there from a set with four elements to a set with six elements?

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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(a) How many one-to-one functions are there from a set with four elements to a set with five elements?
There are 120
choices for where to send the first element of the domain, 5
(b) How many one-to-one functions are there from a set with four elements to a set with three elements?
0
choices for where to send the second element of the domain, and so forth. Thus, the total number of one-to-one functions is 120
(c) How many one-to-one functions are there from a set with four elements to a set with four elements?
24
(d) How many one-to-one functions are there from a set with four elements to a set with six elements?
360
How many one-to-one functions are there from a set with m elements to a set with n elements, where m s n?
n!
(n-m)!
Transcribed Image Text:(a) How many one-to-one functions are there from a set with four elements to a set with five elements? There are 120 choices for where to send the first element of the domain, 5 (b) How many one-to-one functions are there from a set with four elements to a set with three elements? 0 choices for where to send the second element of the domain, and so forth. Thus, the total number of one-to-one functions is 120 (c) How many one-to-one functions are there from a set with four elements to a set with four elements? 24 (d) How many one-to-one functions are there from a set with four elements to a set with six elements? 360 How many one-to-one functions are there from a set with m elements to a set with n elements, where m s n? n! (n-m)!
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