Question 453825: The phone system within a school assigns 4-digit phone numbers.
If the phone numbers are randomly assigned, what is the probability that you will be assigned a phone number that ends in 0, if the digits may repeat.
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! The phone system within a school assigns 4-digit phone numbers.
If the phone numbers are randomly assigned, what is the probability that you will be assigned a phone number that ends in 0, if the digits may repeat.
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Ways to pick each of the first three digits: 10
Ways to pick the 4 digit: 1
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# of phone numbers ending in zero: 10^3*1 = 1000
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Total # of possible phone numbers: 10^4
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P(phone number ending in 0) = 1000/10,000 = 1/10
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Cheers,
Stan H
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