Originally Posted by

**aeubz** Hi again guys,

The following two problems is from an onto section of my discrete math textbook. I don't understand what they are asking for. I asked a tutor for help, and he didn't know how to do it either.. Please help! .. Got finals today..

1)How many onto functions are there from a set with three elements to a set with five elements?

2)How many onto functions are there from a set with four elements to a set with two elements?

3)How many onto functions are there from a set with four elements to a set with three elements?