Question

Set A has 3 elements and set B has 4 elements. The number of injections that can be defined from A into B is :

• A. 144
• B. 12
• C. 24
• D. 64

Answer 1

The correct option is C 24

Number of injections from set A to Set B${=}^4{p}_3=\frac{4!}{(4-3)!}=4\times 3\times 2=24$