3.68. Seven boys and five girls have 12 movie tickets: 5 tickets for seats in row IX and 7 tickets for seats in X row. In how many ways can they take these seats: (a) arbitrarily (b) in such a way that all the girls sit in the ninth row (c) in both rows alternately: boy, girl, boy, girl, etc.?

3.68. Seven boys and five girls have 12 movie tickets: 5 tickets for seats in row IX and 7 tickets for seats in X row. In how many ways can they take these seats: (a) arbitrarily (b) in such a way that all the girls sit in the ninth row (c) in both rows alternately: boy, girl, boy, girl, etc.?

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Question

3.68. Seven boys and five girls have 12 movie tickets: 5 tickets for seats in row IX and 7 tickets for seats in X row. In how many ways can they take these seats:
(a) arbitrarily
(b) in such a way that all the girls sit in the ninth row
(c) in both rows alternately: boy, girl, boy, girl, etc.?

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