Concept explainers
To find: The probability of that the books are arranged either incorrect way or in reverse order.
Answer to Problem 11WE
The probability that the books can be arranged in either correct or reverse order is
Explanation of Solution
Given information:
The given information isa six-volume set of books placed on shelf at random.
Calculation:
We have to find the probability that the books are arranged either incorrect way or in reverse order. The two events, arranging in correct order and arranging in reverse order, are mutuallyexclusive events.
We know that for two mutually exclusive events
Thus, the required probability is
We know that the books can be arranged in the shelf in
The books can be arranged in reverse order also in only
Substitute the known values in
Therefore, the probability that the books can be arranged in either correct or reverse order is
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Algebra and Trigonometry: Structure and Method, Book 2
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