Most phone numbers have seven digits after the area code, where each digit can be 0-9. How many different phone numbers can there be in one area code

9 * 10⁶ = 9,000,000

Step-by-step explanation:

Data provided in the question:

The phone number is of 7 digits

i. e

we have 7 blanks to fill

also,

we have choices from 0-9 i. e 10 number of choices

Now,

the first digit of the number cannot be zero

Thus,

we have only 9 choices out of 10 for the first digit

And, for the rest of the 6 blanks we have 10 choices for each

Therefore,

The total number of different phone numbers can there be in one area code that can be formed

= 9 * 10 * 10 * 10 * 10 * 10 * 10

= 9 * 10⁶

= 9,000,000