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If p, q, r and s are different prime numbers less than 20, what is the greatest possible value of (p+q)/(r+s)?

 Nov 28, 2020
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Write out the list of primes that are less than 20  ...easy-peasy

  Put the two largest ones in the numerator

   Put the two smalles ones in denominator.....do the math...done!

 Nov 28, 2020

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