A telephone company can issue telephone numbers consisting a 10-digit calling number. The 5-digit number must comm contain no repeated digits. The 10-digit number must comm and may contain repeated digits. How many distinct teleph tifer

A telephone company can issue telephone numbers consisting a 10-digit calling number. The 5-digit number must comm contain no repeated digits. The 10-digit number must comm and may contain repeated digits. How many distinct teleph tifer

Algebra: Structure And Method, Book 1

(REV)00th Edition

ISBN:9780395977224

Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole

Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole

Chapter2: Working With Real Numbers

Section2.3: Rules For Addition

Problem 7P

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Question

A telephone company can issue telephone numbers consisting of a 5-digit area code and
a 10-digit calling number. The 5-digit number must commence with an 0, and must
contain no repeated digits. The 10-digit number must commence with a non-zero digit,
and may contain repeated digits. How many distinct telephone numbers can be issued
by the company? You must justify your answer.

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Why is it 27216 rather than 3024? and 109 instead of 9,000,000,000?

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