How many different license plate can be made with seven symbols where the first three are letters and the next four are numbers and a) the letters and numbers can be repeated b) the letters can’t be repeated and the numbers can’t be repeated

How many different license plate can be made with seven symbols where the first three are letters and the next four are numbers and a) the letters and numbers can be repeated b) the letters can’t be repeated and the numbers can’t be repeated

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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Question

How many different license plate can be made with seven symbols where the first three are letters and the next four are numbers and

a) the letters and numbers can be repeated

b) the letters can’t be repeated and the numbers can’t be repeated

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