Prime Numbers

What is the probability of getting 2 prime nos. from 1 to 20?

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shafreenz
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Aug 30th, 2010
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Mark Haynes
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Feb 13th, 2012

Given that there are 8 Prime Numbers under 20, and if the limit is only random numbers under 20 then there is a 40% chance of getting a prime number.

Mark Haynes
Profile Answers by Mark Haynes Questions by Mark Haynes

Feb 13th, 2012

I hit the send before I was finished, to continue: since the random picking of a number under 20 is still a independent event, the chance for picking a 2nd prime number is still the same... 40%