How many one-one functions are there in all…

How many one-one functions are there in all from this A to this B?

Question 89

MediumOriginal question

$A = \{1, 2, 3, 4\}$ , $B = \{a, b, c, d, e\}$ , and $f : A \to B$ is $f = \{(1, a), (2, c), (3, e), (4, b)\}$ .

How many one-one functions are there in all from this $A$ to this $B$ ?

5

Correct answerYour answer

24

Correct answerYour answer

120

Correct answerYour answer

625

Correct answerYour answer

Show the answer and explanation

CorrectNot quiteAnswer C

Correct answer: C

Worth noting

625 is $5^{4}$ , every function, repeats allowed.

Ten questions from Relations & Functions, at your own pace.

Ten questions from Relations & Functions, at your own pace.