During the May Day holiday, a certain unit organized some employees to travel to three places: A, B, and C. The types and quantities of tickets purchased by the company to various places were drawn i

During the May Day holiday, a certain unit organized some employees to travel to three places: A, B, and C. The types and quantities of tickets purchased by the company to various places were drawn into a bar system.

Solution: (1) 30; 20;

(2);

(3) The list of all possible results is as follows:

< p>

Or draw a tree diagram as follows:

***There are 16 possible results, and each is equally likely, of which the smallest There are 6 results for Zhang getting a ticket: (2,1), (3,1), (3,2), (4,1), (4,2), (4,3),

< p>∴The probability of Xiao Zhang getting the ticket is;

Then the probability of Xiao Li getting the ticket is,

∴This rule is unfair to both Xiao Zhang and Xiao Li.