Counting injective functions

ComputeCounting functions and subsetsInjective and surjective functions

Let $A = \{1, 2, 3\}$ and $B = \{1, 2, 3, 4, 5\}$ . How many injective functions $f\colon A \to B$ are there?

Enter an exact value or a decimal.

Counting injective functions · Proofwise

ComputeCounting functions and subsetsInjective and surjective functions

Let $A = \{1, 2, 3\}$ and $B = \{1, 2, 3, 4, 5\}$ . How many injective functions $f\colon A \to B$ are there?

Enter an exact value or a decimal.