Ann remembers the last four digits of a seven-digit telephone number but knows only that each of the first three digits is an odd number. Find the maximum number of telephone calls she must make before she dials the correct number when: a) the first three digits are different b) digits can be repeated.

Ann remembers the last four digits of a seven-digit telephone number but knows only that each of the first three digits is an odd number. Find the maximum number of telephone calls she must make before she dials the correct number when: a) the first three digits are different b) digits can be repeated.

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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a) the first three digits are different

b) digits can be repeated.

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