Answered: When dialing a friend's phone number, a…

When dialing a friend's phone number, a person forgot the last four digits, and only remembers that two of the four were the same. How many different ways can the person mark?

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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When dialing a friend's phone number, a person forgot the last four digits, and only remembers that two of the four were the same. How many different ways can the person mark?

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