Need math help: How many international direct dialing number?

label Mathematics
account_circle Unassigned
schedule 1 Day
account_balance_wallet $5

How many international direct-dialing numbers are possible if each number consists of a four-digit area code (the first digit of which must be nonzero) and an eight-digit telephone number (the first digit must be nonzero)?
Nov 15th, 2015

Thank you for the opportunity to help you with your question!

We have 4 + 8 = 12 number of events occurring simultaneously.

Where these 12 events represent the digit values.

1st digit has only 9 possible values.

5th digit has only 9 possible values.

The rest of the 10 digits have 10 possible values.

We multiply their individual possible outcomes and get:

(9^2 )*(10^10) = 810,000,000,000

Answer choice C.) 810,000,000,000

Please let me know if you need any clarification. I'm always happy to answer your questions.
Nov 15th, 2015

Studypool's Notebank makes it easy to buy and sell old notes, study guides, reviews, etc.
Click to visit
The Notebank
Nov 15th, 2015
Nov 15th, 2015
Sep 24th, 2017
Mark as Final Answer
Unmark as Final Answer
Final Answer

Secure Information

Content will be erased after question is completed.

Final Answer