Let X and Y denote the sets containing 2 and 20 distinct objects respectively and F denote the set of all possible functions defined from X and Y. Let f be randomly chosen from F. The probability of f being one-to-one is _________

Let X and Y denote the sets containing 2 and 20 distinct objects respe

1.	Let X and Y denote the sets containing 2 and 20 distinct objects respectively and F denote the set of all possible functions defined from X and Y. Let f be randomly chosen from F. The probability of f being one-to-one is _________
A.	0.95
B.	0.80
C.	0.75
D.	0.70
Answer» B. 0.80

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