3. My parents just started their digital music collection. If they have put cd's by 4 different groups on their mp3 player, how many songs will they need to listen to to ensure that they hear at least one group twice?

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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please help me find answer the number 3?

1. How many subsets of the set {a, b, c, d, e, f, g, h, i} contain 4 elements?
2. How many 3 element subsets of the set {a, b, c, d, e, f, g, h, i} contain no vowels?
3. My parents just started their digital music collection. If they have put cd's by 4 different groups on their mp3 player,
how many songs will they need to listen to to ensure that they hear at least one group twice?
Transcribed Image Text:1. How many subsets of the set {a, b, c, d, e, f, g, h, i} contain 4 elements? 2. How many 3 element subsets of the set {a, b, c, d, e, f, g, h, i} contain no vowels? 3. My parents just started their digital music collection. If they have put cd's by 4 different groups on their mp3 player, how many songs will they need to listen to to ensure that they hear at least one group twice?
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