Let A and B be any two sets such that n(B)=P, n(A)=q then the total number of functions f:` A -> B` is equal to

Explanation

Let `A = {1,2,3,4}`

`B = {a,b)`

Here, total number of functions possible `= 2**2**2**2 = 2^4`.
Here, `n(A) = 4 and n(B) = 2`.

So, when, `n(A) = q and n(B) = p`,

Then total number of functions possible `=p^q`.