$f : \{1, 2, 3\} \to \{4, 5, 6, 7\}$ has $f(1) = 4$ and $f(2) = 6$ . How many choices of $f(3)$ make $f$ one-one?

1

Correct answerYour answer

2

Correct answerYour answer

3

Correct answerYour answer

4

Correct answerYour answer

Show the answer and explanation

CorrectNot quiteAnswer B

Correct answer: B

Worth noting

4 lets $f(3)$ take an image already used by 1 or 2.

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

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

f:{1,2,3}→{4,5,6,7}f : \{1, 2, 3\} \to \{4, 5, 6, 7\}f:{1,2,3}→{4,5,6,7} has f(1)=4f(1) = 4f(1)=4 and f(2)=6f(2) = 6f(2)=6. How many choices of f(3)f(3)f(3) make fff one-one?