The Math Forum

Ask Dr. Math - Questions and Answers from our Archives
Associated Topics || Dr. Math Home || Search Dr. Math

Maximum Possible Combinations

Date: 1/23/96 at 3:32:55
From: Raphael Oscar Rues


I wonder if you can tell me how can I calculate the following:

...Which is the maximal number of possibilities that I can obtain for 
n = digit?  - like having a phone number with 9 digits.  How many 
users could I theoretically cover? 

Thanks in advance for your help,


Date: 6/12/96 at 22:36:13
From: Doctor Jodi

Hi there!  If you have a 9 digit phone number with any digit from 
0-9 in each of the 9 places, you multiply 

10 digits * 10 digits * 10 digits * 10 digits * 10 digits * 10 digits *
10 digits * 10 digits * 10 digits

Since each of 9 times you have 10 choices for the number.

-Doctor Jodi,  The Math Forum

Associated Topics:
High School Permutations and Combinations

Search the Dr. Math Library:

Find items containing (put spaces between keywords):
Click only once for faster results:

[ Choose "whole words" when searching for a word like age.]

all keywords, in any order at least one, that exact phrase
parts of words whole words

Submit your own question to Dr. Math

[Privacy Policy] [Terms of Use]

Math Forum Home || Math Library || Quick Reference || Math Forum Search

Ask Dr. MathTM
© 1994- The Math Forum at NCTM. All rights reserved.