Question

The mapping diagram shows a function.

What could be a possible value for the
missing number n?
A7
C9
B8
D 15

Answer 1

Explanation:

Numbers 7, 8 and 9 in the domain each already has an image in the co-domain (3, 1 and 1 respectively)

Since n has 2 as its image, n cannot be 7, 8 or 9. Therefore the best answer here is 15. (D)