4. A witness to a hit and run accident told the police that the license number contained the letters RLH followed by 3 digits, the first of which is a 5. If the witness cannot recall the last 2 digits, but certain that all 3 digits are different, find the maximum number of automobile registrations that the police may have to check.
4. A witness to a hit and run accident told the police that the license number contained the letters RLH followed by 3 digits, the first of which is a 5. If the witness cannot recall the last 2 digits, but certain that all 3 digits are different, find the maximum number of automobile registrations that the police may have to check.
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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4. A witness to a hit and run accident told the police that the license number contained
the letters RLH followed by 3 digits, the first of which is a 5. If the witness cannot recall the
last 2 digits, but certain that all 3 digits are different, find the maximum number of
automobile registrations that the police may have to check.
5. a) How many ways can 6 people be lined up to get on a bus?
b) If a certain 3 persons insist on following each other, how many ways are possible?
c) If a certain 2 persons refuse to follow each other, how many ways are possible?
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