By Sheldon M. Ross
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Additional resources for A First Course in Probability (8th Edition)
Determine the number of vectors (x1 , . . , xn ), such that each xi is either 0 or 1 and n the choice of the chair, argue that there are n (n − k + 1) possible choices. k − 1 (c) By focusing ﬁrst on the choice of the chair and then on the choice of the other committee n − 1 members, argue that there are n k − 1 possible choices. (d) Conclude from parts (a), (b), and (c) that k n k = (n − k + 1) (e) Use the factorial deﬁnition of n + m r = n 0 m r +··· + + n r n 1 m r − 1 m 0 Hint: Consider a group of n men and m women.
40)! 20 2 (20)! ]2 (40)! To determine P2i , the probability that there are 2i offensive–defensive pairs, we ﬁrst 2 20 ways of selecting the 2i offensive players and the 2i defennote that there are 2i sive players who are to be in the offensive–defensive pairs. These 4i players can then 40 Chapter 2 Axioms of Probability be paired up into (2i)! possible offensive–defensive pairs. ) As the remaining 20 − 2i offensive (and defensive) players must be paired among themselves, it follows that there are 2 20 2i (2i)!
6. A well-known nursery rhyme starts as follows: “As I was going to St. Ives I met a man with 7 wives. Each wife had 7 sacks. Each sack had 7 cats. Each cat had 7 kittens. ” How many kittens did the traveler meet? 7. (a) In how many ways can 3 boys and 3 girls sit in a row? (b) In how many ways can 3 boys and 3 girls sit in a row if the boys and the girls are each to sit together? (c) In how many ways if only the boys must sit together? (d) In how many ways if no two people of the same sex are allowed to sit together?