A phone number is a 7-digit that does not start with 0. Call a phone numbers thatmake up of exactly 2 different digits. For example, "1111112" and "8111881" areacceptable, but “1111111" and "1234567" are not. How many possible phonenumbers are there that contain 2 different digits? .

A phone number consists of 7 -digit that does not start with 0. To find the possible phone numbers…

Answered: A phone number is a 7-digit that does…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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A phone number is a 7-digit that does not start with 0. Call a phone numbers that make up of exactly 2 different digits. For example, "1111112" and "8111881" are acceptable, but “1111111" and "1234567" are not. How many possible phone numbers are there that contain 2 different digits? .