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March 29, 2017

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Two consecutive odd primes, such as 11 and 13, are called a pair of "twin primes" how many pairs of twin primes are there between 15 and 45?

F-2
G-3
H-4
J-5
K-7

  • math - ,

    Make a list of odd consecutive pairs. It cannot include 15, 21, 25, 27, 33, 35, 39, or 45.
    17 - 19
    29 - 31
    41 - 43
    A total of three

    I can't think of any others. Can you?

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