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The digits 1, 2, 3, 4, 5, 6, 7, and 9 are used to form four two-digit prime numbers, with each digit used exactly once. What is the sum of these four primes

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sqdancefan

Answer:

  190

Step-by-step explanation:

The even digits and 5 cannot be in the units place of any 2-digit prime. That means the sum must be ...

  (2 +4 +5 +6)×10 +(1 +3 +7 +9) = 170 +20 = 190

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There are several ways the set of primes can be created. A couple are ...

  {23, 41, 59, 67} or {29, 47, 53, 61}

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