Which expression gives the probability that the three winners are you and your two siblings? (yes, you put your tickets in the hat).  Assume that the drawing is random.

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
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Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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After a concert, three tickets are drawn from a hat to determine the three lucky winners of a CD signed by the artist. 
80 people put their tickets into that hat. Which expression gives the probability that the three winners are you and your two siblings? (yes, you put your tickets in the hat). 
Assume that the drawing is random. 


a. C(3,1)C(77,2)/C(80,3)
b. 3!/C(80,3)
c. None of the other answers is correct.
d. 3!/80!
e. 1/C(80,3)
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