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Chapter 13: Q 4. (page 847)
True or False If A is a set, the complement of A is the set of all the elements in the universal set that are not in A.
True.
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Lining People Up In how many ways can 4 people be lined up?
What is the probability that at least 2 people have the same birthday in a group of 12 people? Assume that there are 365 days in a year.
A(n) ___________ is an arrangement of r objects chosen from n distinct objects, without repetition and without regard to order.
An urn contains 15 red balls and 10 white balls. Five balls are selected. In how many ways can the 5 balls be drawn from the total of 25 balls:
(a) If all 5 balls are red?
(b) If 3 balls are red and 2 are white?
(c) If at least 4 are red balls?
The U.S. Senate has 100 members. Suppose that it is desired to place each senator on exactly 1 of 7 possible committees. The first committee has 22 members, the second has 13, the third has 10, the fourth has 5, the fifth has 16, and the sixth and seventh have 17 apiece. In how many ways can these committees be formed?
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