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http://prntscr.com/ndcj9c

 Apr 17, 2019
 #1
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+2

Integers between 20 and 40  =  19  = B

 

We have 4 primes  from 20 to 40  = A

 

So  P ( A l B)   =   4 / 19  ≈  0.21 

 

  

 

 

cool cool cool

 Apr 17, 2019

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