How many onto functions are there from this A…

How many onto functions are there from this A to this B?

Question 88

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 onto functions are there from this $A$ to this $B$ ?

0

Correct answerYour answer

1

Correct answerYour answer

5

Correct answerYour answer

120

Correct answerYour answer

Show the answer and explanation

CorrectNot quiteAnswer A

Correct answer: A

Worth noting

120 counts the one-one functions.

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

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