Posted by **Katie** on Thursday, April 17, 2008 at 8:31pm.

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.

## Answer this Question

## Related Questions

- Precalculus - 1. permutation or combination: how many schedules are possible if ...
- math - Suppose a code consist of two letters followed by a digit. Find the ...
- math - Suppose a code consist of two letters followed by a digit. Find the ...
- Discrete Math - Each Student at a certain university is given a 6-digit code (...
- Permutation need help plz - How many 4 digit codes can we make provided that -...
- Math grd 12 - You are setting a system programing codes for a universal TV ...
- LSAT PREP - A company employee generates a series of five-digit product codes in...
- st130 - security codes in fiji are made up of 4 digits. how many different 4 ...
- math30 - A security code used to consist of two odd digits, followed by four ...
- math - As you travel to new planets in the space age, you discover a culture ...

More Related Questions