Concept explainers
To find: The probability of not chosen the ticket to get the free haircuts.

Answer to Problem 20PPS
The probability of not chosen the tickets that provide the free haircuts is
Explanation of Solution
Given information:
Total number of tickets is
Concept used:
The formula of probability of an event E is as follows:
Calculation:
As it is given that the man “Wakim” chosen the 6 tickets and the total number of tickets is
So, the number of tickets that “Wakim” not chosen is
Consider, the event E as not chosen the tickets that provides the free haircuts.
So, the probability of not chosen the tickets that provides the free haircuts is as follows:
Therefore,the probability of not chosen the tickets that provides the free haircuts is
Conclusion:
Thus,the probability of not chosen the tickets that provides the free haircuts is
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