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What is the probability that a 7-digit phone number contains at least one 9?

What is the probability that a 7-digit phone number contains at least one 9?
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What is the probability that a 7-digit phone number contains at least one 9?

User Zummon
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1 Answer

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6279913/10^7

That is what the probability that a 7-digit phone number would contain one singular number.
User Johndbritton
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