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A phone number in Toronto is a 10-digit number. The first three is an area code which is 416, 905, or 289. How many different telephone numbers can exist if The other 7 digite oso ho abor from

A phone number in Toronto is a 10-digit number. The first three is an area code which is 416, 905, or 289. How many different telephone numbers can exist if The other 7 digite oso ho abor from

Advanced Engineering Mathematics
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 phone number in Toronto is a 10-digit number. The first three is an area code which is 416, 905, or 289. How many different telephone numbers can exist if • The other 7 digits can be any number from 0-9. • No number has repeating numbers. • If the 7 digits cannot all be the same number
Transcribed Image Text:A phone number in Toronto is a 10-digit number. The first three is an area code which is 416, 905, or 289. How many different telephone numbers can exist if • The other 7 digits can be any number from 0-9. • No number has repeating numbers. • If the 7 digits cannot all be the same number
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