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OpenStudy (anonymous):
let n be a randomly selected integer from 1 to 20. find the indicated probability (n is prime given that it has 2 digits)
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OpenStudy (anonymous):
P(B|A)=P(AandB)/P(A) P(prime|2digits)=P(prime and 2digit)/P(prime) = (4/20) / (11/20) = 4/11
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