a) Count the number of distinct phone numbers, if a valid phone number must have the format NXX-NXX-XXXX where N can be any integer between 3 and 8 inclusive, and X can be any integer between 0 and 9 inclusive. b) How many bit strings of length 20 begin with 11 and end with 00?

a) Count the number of distinct phone numbers, if a valid phone number must have the format NXX-NXX-XXXX where N can be any integer between 3 and 8 inclusive, and X can be any integer between 0 and 9 inclusive. b) How many bit strings of length 20 begin with 11 and end with 00?

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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Question

a) Count the number of distinct phone numbers, if a valid phone number must have the format NXX-NXX-XXXX where N can be any integer between 3 and 8 inclusive, and X can be any integer between 0 and 9 inclusive.
b) How many bit strings of length 20 begin with 11 and end with 00?

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