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Solve quickly please.,.. [10 pts] Let C and D be finite sets and let f : C - D and 9 : D - C

Solve quickly please.,..

[10 pts] Let C and D be finite sets and let f : C - D and 9 : D - C be two functions such that A = ((1)6)/ q>fiA Prove that |C| 2 |DI

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