7. A combination lock opens with the correct four-digit code. Each wheel rotates through thedigits 1 to 7.a) How many different four-digit codes are possible?b) Suppose each number can be used only once in a code. How many differentcodes are possible when repetition is not allowed?

We have given combination lock opens with the correct four digit code and each wheel rotates through…

Answered: 7. A combination lock opens with the…

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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7. A combination lock opens with the correct four-digit code. Each wheel rotates through t digits 1 to 7. a) How many different four-digit codes are possible? b) Suppose each number can be used only once in a code. How many different codes are possible when repetition is not allowed?