A published poll has indicated that 1 out of 15 people who use
regular gasoline will pay $.40/gallon more for regular gasoline
without ethanol.
A local service station sells both regular-grade gasolines with ethanol and regular-grade gasoline without ethanol. What is the probability that the 20th person visiting the service station to purchase regular gasoline will be the 4th person to purchase regular gasoline without ethanol?
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