Question
Number of functions from Set-A containing 5 elements to a Set-B containing 4 elements is
- 4!
- 5!
Hint:
In this question we will assume the number of functions from Set- A to be containing m elements and Set-B to be containing n elements. Using total function is 
we can further find the value.
The correct answer is:
Let number of functions from Set- A containing m elements (m=5) and Set-B containing n elements (n=4).
So, total function = n+ n+ ........m th times =
Hence, number of functions from Set-A containing 5 elements to a Set-B containing 4 elements is .
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