larypin2741 larypin2741
  • 08-06-2018
  • Mathematics
contestada

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

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joshh9ix joshh9ix
  • 08-06-2018
6279913/10^7

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