For how many ne {1,2,., 490} is n a multiple of one or more of 9, 8, or 7? ...
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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Discrete Math

Transcribed Image Text:**Question:**
For how many \( n \in \{1, 2, \ldots, 490\} \) is \( n \) a multiple of one or more of 9, 8, or 7?
**Answer:**
179
**Hint:**
To find out how many numbers are divisible by 9 and 7, for example, take 490/(9.7) and round down.
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