Posted by anne on Sunday, December 9, 2012 at 8:14pm.
18
could u please explain how u work it out,thanks
1 2 3
1 2 3
(1,1)(1,2)(1,3)
(2,1)(2,2)(2,3)
(3,1)(3,2)(3,3)
Total of 18 selections and 9 pairs
understood?
sorry, I 'm still not understand
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