Suppose we want to choose 4 letters, without replacement, from 18 distinct letters. (a) How many ways can this be done, if the order of the choices does not matter? (b) How many ways can this be done, if the order of the choices matters?

Suppose we want to choose 4 letters, without replacement, from 18 distinct letters. (a) How many ways can this be done, if the order of the choices does not matter? (b) How many ways can this be done, if the order of the choices matters?

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

Suppose we want to choose 4 letters, without replacement, from 18 distinct letters.

(a)	How many ways can this be done, if the order of the choices does not matter?

(b)	How many ways can this be done, if the order of the choices matters?

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