Problem 3. A drawer contains socks of 8 different colours. How many socks must you pull out of the drawer to be certain that you have two of the same colours? Problem 4. In the 403 area code, how many of the 10-digit phone numbers (where any combi- nation of digits is allowed) contain at least one of each odd digit?
Problem 3. A drawer contains socks of 8 different colours. How many socks must you pull out of the drawer to be certain that you have two of the same colours? Problem 4. In the 403 area code, how many of the 10-digit phone numbers (where any combi- nation of digits is allowed) contain at least one of each odd digit?
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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