Chapter 6: Problem 3
One die is rolled. What is the probability of not getting a \(5 ?\)
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These are the key concepts you need to understand to accurately answer the question.
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Chapter 6: Problem 3
One die is rolled. What is the probability of not getting a \(5 ?\)
These are the key concepts you need to understand to accurately answer the question.
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If the coin is flipped 10 times, what is the probability of at least one head given at least one tail?
Prove that \(2 C(2 n-1, n)=C(2 n, n)\) for all \(n \geq 1\).
What is wrong with the following argument, which supposedly counts the number of partitions of a 10 -element set into eight (nonempty) subsets? List the elements of the set with blanks between them: $$x_{1}-x_{2}-x_{3}-x_{4}-x_{5}-x_{6}-x_{7}-x_{8}-x_{9}-x_{10}$$ Every time we fill seven of the nine blanks with seven vertical bars, we obtain a partition of \(\left\\{x_{1}, \ldots, x_{10}\right\\}\) into eight subsets. For example, the partition \(\left\\{x_{1}\right\\},\left\\{x_{2}\right\\},\left\\{x_{3}, x_{4}\right\\}\left\\{x_{5}\right\\},\left\\{x_{6}\right\\},\) \(\left\\{x_{7}, x_{8}\right\\}\left\\{x_{9}\right\\},\left\\{x_{10}\right\\}\) would be represented as $$x_{1}\left|x_{2}\right| x_{3} x_{4}\left|x_{5}\right| x_{6}\left|x_{7} x_{8}\right| x_{9} \mid x_{10}$$ Thus the solution to the problem is \(C(9,7)\).
Prove that a planar polygon with \(n\) sides, \(n \geq 3,\) has at least three interior angles each less than 180 degrees. Assume no 0-degree interior angles. As an example, in the following figure angles \(A, C,\) and \(E\) are each less than 180 degrees.
Exercises \(47-50\) ask about the following situation. In a small charity fundraiser, 70 tickets are sold numbered 1 through \(70 .\) Each person buys one ticket. Later in the evening. 20 numbers are randomly drawn from among \(I\) through 70 , and those holding these numbers win modest prizes. Among those buying the tickets are Maya and Chloe. What is the probability that both Maya and Chloe win prizes?
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