Posted by Robert on Sunday, May 3, 2009 at 8:34pm.
If every seven digit whole neumber is a possible phone number, except those that begin with 0 or 1, what fraction of telephone numbers begin with 9 and end with 0?

Math  bobpursley, Sunday, May 3, 2009 at 9:00pm
wouldn't it be 1/8 * 1/10 ?

Math  PsyDAG, Monday, May 4, 2009 at 12:06pm
Since the first number cannot be 0 or 1, you have 1/8 probability of getting a 9. The probability of the last number being 0 is 1/10.
The probability of two or more events all occurring is found by multiplying the individual probabilities.
I hope this helps you to understand the process to solve similar problems. Thanks for asking.
Answer This Question
Related Questions
 Math grd 12  How many different sevendigit telephone numbers are possible if ...
 Math  1.) A security code has seven characters. Each code begins with two ...
 Math. Explain  From the digits 1, 2, 3, and 4, how many positive integers are ...
 Math  A warranty identification number for a certain product consists of a ...
 math  a 7 digit phone number has a 3 digit prefix followed by 4 digits.how many...
 4th grade math  a 4 digit whole number is added to a 2 digit whole number. ...
 Math  What are irrational, rational, and natural numbers? A rational number is ...
 math  How many SevenDigit numbers less than 1,048,000 can be using the digits ...
 Math  How many seven digit numbers less than 1.048,000 can be made using the ...
 Math  How many sevendigit numbers less than 1,048,000 can be made using the ...
More Related Questions