Question

a) How many onto functions are there from a set with six elements to a set with three elements?​

Answer 1

Answer:

can't understand your question

Answer 2

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An onto function from a set of 4 elements to a set of 3 elements must map two of the four elements to one of the three elements. There are C(4, 2)C(3, 1) = 18 ways to do this.

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