Question

In the city of Lawrenceville, how many phone numbers are possible using the area code 678? The restrictions for the phone company are listed below. · The first digit of the phone number cannot be numbers 0-5. · The second number cannot be a zero. · The third and fourth numbers cannot be a zero or one · The fifth number cannot be a zero, one or two How many phone numbers are possible using the area code 678? a.2000 b.1,6128 c.1,612,800 d.300

Answer 1

Answer:

Hey there!

If there were no restrictions, there would be 10x10x10x10x10 phone numbers.

The first number can only be a 6-9, so that is four options.

The second number can have nine options.

The third and fourth numbers have eight options.

The fifth number has seven options

4x9x8x8x7=16128.

16128 numbers are possible.

Let me know if this helps :)