Set A has 3 elements, and set B has 4 elements. Then the number o… - Vidyadip

Question

Set A has 3 elements, and set B has 4 elements. Then the number of injective mappings that can be defined from A to B is:

24
12
64
144

✓

Answer

24

Solution:

The total number of injective mappings from the set containing 3 elements into the set containing 4 elements is ⁴P₃ = 4! = 4 × 3 × 2 × 1 = 24.

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