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Posted by **anne** on Sunday, December 9, 2012 at 8:14pm.

- math -
**khan**, Sunday, December 9, 2012 at 8:30pm18

- math -
**lindy**, Sunday, December 9, 2012 at 8:34pmcould u please explain how u work it out,thanks

- math -
**khan**, Sunday, December 9, 2012 at 8:38pm1 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?

- math -
**lindy**, Sunday, December 9, 2012 at 8:42pmsorry, I 'm still not understand

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