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Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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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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