You know that the extension of a private telephone number is 272 but you have forgotten the last 4 digits. You can only recall that the last 4 digits are 3, 6, 8 and 9. What is the maximum number of telephone call you will need to make in order to dial the correct number?
You know that the extension of a private telephone number is 272 but you have forgotten the last 4 digits. You can only recall that the last 4 digits are 3, 6, 8 and 9. What is the maximum number of telephone call you will need to make in order to dial the correct number?
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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Transcribed Image Text:You know that the extension of a private telephone number is 272 but you have forgotten the
last 4 digits. You can only recall that the last 4 digits are 3, 6, 8 and 9. What is the maximum
number of telephone call you will need to make in order to dial the correct number?
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