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There are 20 numbers from 20 through 39, and 4 of them are prime (23, 29, 31, 37), the probability is 4 in 20 or 0.20.

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โˆ™ 2011-01-17 07:04:36
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Q: What is the theoretical probability of getting a prime number if you randomly pick a number from 20 through 39?
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