A seven digit telephone number can begin with any digit except 0or1
1.how many possible choices are there for the first digit?the second digit?the third digit?the seventh digit?
2.how many different seven digit telephone numbers are possible?

Question

A seven digit telephone number can begin with any digit except 0or1
1.how  many possible choices are there for the first digit?the second digit?the third digit?the seventh digit?
2.how many different seven digit telephone numbers are possible?

anonymous · Answer

so you have a telephone number in the format YXXXXXXX where 

$$1Y 10~and~x <10$$

anonymous · Answer

oh something went wrong there

anonymous · Answer

$$1 < Y < 10~and~X<10$$

anonymous · Answer

So, which numbers can you possibly get for the first digit? (Y)?

anonymous · Answer

how many numbers are there between 1 and 10, not including 1 and 10 itself?

anonymous · Answer

@angelxlove are you there? i want to help you but i can't help you if you can't answer a question like this.

anonymous · Answer

how u solve it ? from 1-9 or 2-9 ?

anonymous · Answer

From 2-9

anonymous · Answer

because 0 and 1 are not allowed for the first digit

anonymous · Answer

A seven digit telephone number can begin with $ \color{red}{ any~digit~except~0~or~1} $

that's the clue

anonymous · Answer

oh i get it thanks

anonymous · Answer

yw