Asked by Kal Jay
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 a five-digit telephone numbers (the first digit must be nonzero)?
a. 567,000,000
b. 486,000,000
c. 1,053,000,000
d. 729,000,000
e. 810,000,000
Thank you for helping.
a. 567,000,000
b. 486,000,000
c. 1,053,000,000
d. 729,000,000
e. 810,000,000
Thank you for helping.
Answers
Answered by
Steve
9*10^3 * 9*10^4
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