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A city has to accommodate for 9.99 million households requiring a telephone number. They are about to issue 8-digit telephone numbers, with 5 as the first digit.

How many different telephone numbers can be created if repetition of digits is  allowed?

 Jan 29, 2021
 #1
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first digit must be a 5     so the remaining 7 digits can be anything (0-9) but they all start with a 5

 

107    = 10,000,000  phone numbers

 Jan 29, 2021
 #2
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thank you guest!!

xxJenny1213xx  Jan 29, 2021
 #3
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Why did you repeat your question?

The answer on your prior post is correct; this answer is not....

 Jan 29, 2021
 #4
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this is if the digit is allowed, the other question is if the digits are not allowed

xxJenny1213xx  Jan 29, 2021
 #5
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OH it is a different question... Sorry!

Guest Jan 29, 2021
 #6
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its ok!

xxJenny1213xx  Jan 29, 2021

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