7.) Several years ago, the US began running out of telephone numbers. Telephone companies introduced new area codes and numbers were used up, and eventually almost all area codes were used up. (a) Until recently, all area codes had a 0 or 1 as the middle digit, and the first digit could not be 0 or 1. How many such area codes are possible? (b) The actual number of area codes under this system was 152. What could be the cause of the discrepancy between this number and your answer to part (a)?

7.) Several years ago, the US began running out of telephone numbers. Telephone companies introduced new area codes and numbers were used up, and eventually almost all area codes were used up. (a) Until recently, all area codes had a 0 or 1 as the middle digit, and the first digit could not be 0 or 1. How many such area codes are possible? (b) The actual number of area codes under this system was 152. What could be the cause of the discrepancy between this number and your answer to part (a)?

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...

See similar textbooks

Similar questions

76. Dies which are 1.5cm on a side and 1.0cm on a side, supposing a density of 0.031/per cm^2 and N is 13.5, will have die yielding a. 0.4 and 0.66 b. 0.4 and 1.66 c. 1.4 and 0.66 d. 2.4 and 0.66
Answer the questions below. (a) To log on to a certain computer account, the user must type in a 4-letter password. In such a password, no letter may be repeated, and only the lower case of a letter may be used. How many such 4-letter passwords are possible? (There are 26 letters in the alphabet.) (b) From the 12 albums released by a musician, the recording company wishes to release 9 in a boxed set. How many different boxed sets are possible? O 2021 McGraw Hill LLC. Al Rights Reserved. Terms of Use | Pr ara buscar 10°C Lluvia
Hey! I need help with a question which states the following: How many 7-digit ID numbers are possible if the first digit cannot be 8, the last 2 digits are 24, and repetition is not allowed? Thank you!
2. If SSbetween = 30, SSwithin = 40, dfbetween = 3, and dfwithin = 20, then F = ______.
How many different three-number “combinations” are possible on a combination lock having 46 numbers on its dial?
7
. How many 10 digit phone numbers, Area code + number (***)***-****, are possible if the second digit in the area code has to be a 0 or 1 and the first digit of the number can't be 0?
8.) (a) The US Postal Service uses 5-digit zip codes in many areas. How many such zip codes are possible? (b) How many 9-digit zip-plus-4 codes (now encouraged in many areas) are possible?
40 Ponzi schemers are on the government's hit-list. In how many ways can the government name 3 of them as the number one, number two, and number three most evil Ponzi schemer?
A phone number consists of ten numbers. If the first digit cannot be 0, how many possible numbers can be formed?
A social security number has 3 digits, then 2 digits, then 4 digits. If the first 3 digits can’t be 0, the second 2 digits can’t be 1 or 5, and the last 4 digits can be anything, how many possible cards can be made?
A standard-issue 2020 New Jersey license plate had one letter, then two digits, followed by three letters. New Jersey DOO SPA Garden State These plates were not allowed to have letters D, T, or X in the fourth position, or the letters I, O, or Q in any position. With these restrictions, how many different license plates were possible in 2020?