Question

Can i get help on this?Number of digits in phone number is 7.

Answer 1

There are 7 digits in phone number. The first digit cannot be 0 and 1. So first digit can be filled by 8 numbers (from 2 to 9). Remaining 6 digits of the phone number can be filled by all 10 number (0 to 1).

The possible number of 7 digit phone numbers are,

`8\cdot10\cdot10\cdot10\cdot10\cdot10\cdot10=8,000,000`

So 8,000,000 different numbers are possible.

Answer: 8,000,000