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Each of the first eight prime numbers is placed in a bowl. Two primes are drawn without replacement. What is the probability, expressed as a common fraction, that the sum of the two numbers drawn is a prime number?

 Apr 28, 2020
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2 3 5 7 11 13 17 19

 

there are   8 x 7/2 = 28 combos

here are some possibles   2 3 = 5

  2 5 = 7

 2 11 = 13

  2 17 = 19

 

 

I don't think there are any more.....can you find any more?    4 out of 28

 Apr 28, 2020
edited by ElectricPavlov  Apr 28, 2020

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