How many onto functions are there from a set with n elements to a set with three elements?
Could somebody explain how to do this, perhaps substituting 5 in for n?
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How many onto functions are there from a set with n elements to a set with three elements?
Could somebody explain how to do this, perhaps substituting 5 in for n?
You can solve it by recusive definition: suppose
Letbe the number of onto function from a set with n elements to a set with three elements,
be the number of onto function from a set with n elements to a set with two elements.
then what is the recusive relation between,
while it is easy to see that.