# ALGEBRA

posted by .

Beginning in 1995, three digit area codes could begin with any number except 0 or 1. The middle and last number were not limited. How many area codes became available. I know the answer is 640 but I don't know how to explain that answer.

• ALGEBRA -

NEVERMIND, I used common sense

## Similar Questions

1. ### math

Suppose a code consist of two letters followed by a digit. Find the number of (a) Codes (b) Codes with distinct letters (c) Codes with the same letters
2. ### math

Suppose a code consist of two letters followed by a digit. Find the number of (a) Codes (b) Codes with distinct letters (c) Codes with the same letters.
3. ### Math grd 12

You are setting a system programing codes for a universal TV remote control. Each code will have five digits and cannot include a 0 or repeat any digits. How many codes a)do not contain a 7?
4. ### Precalculus

1. permutation or combination: how many schedules are possible if you need to choose 5 events out of 20 for a vacation?
5. ### Discrete Math

Each Student at a certain university is given a 6-digit code (such as 123789 or 001122) (a) how many different codes are there?
6. ### LSAT PREP

A company employee generates a series of five-digit product codes in accordance with the following rules: The codes use the digits 0, 1, 2, 3, and 4, and no others. Each digit occurs exactly once in any code. The second digit has a …
7. ### Permutation need help plz

How many 4 digit codes can we make provided that -the codes contain of numbers only -codes may not equal to 4000 -codes may not be less than 4000 -numbers may be repeated -codes have to be even numbers?
8. ### Math

You are setting up a system of programming codes for a universal TV remote. Each code will have five digits and cannot include a 0 or repeat any digits. How many codes: A) do not contain a 1?
9. ### probability

In the state of Georgia, telephone numbers consists of 10 digits, including the area code. One of these area codes is 770. The first digit following the area code cannot be 1 or 0. Find the number of possibilities for telephone numbers …
10. ### Algebra

In a plan for area​ codes, the first digit could be any number from 2 through 8, the second digit was either 0 or 1​, and the third digit could be any number except 0. With this​ plan, how many different area codes were​ possible?

More Similar Questions