Posted by **anonymous1** on Wednesday, September 1, 2010 at 8:54am.

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 -
**drwls**, Wednesday, September 1, 2010 at 9:11am
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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