Mathematics

Bryce French

31 May, 08:27

A seven digit telephone number is of the form ABC-DEFG. In one particular state, the

digit 'A' can be any digit except 8 and 9. The digits B and C can be any digit from 1 - 8.

The digits D, E, F, and G can be any digit 0 - 9 except they can't all be the same (e. g.

0000, 1111, 2222, ... etc.). How many seven digit phone numbers are possible with

these restrictions?

5,120,000

5,114,880

4,608,000

10,000,000