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Posted by **chris** on Tuesday, September 25, 2012 at 10:15pm.

- math -
**Reiny**, Tuesday, September 25, 2012 at 10:56pmprob ( that they are the same colour)

= BBB or RRR

= (3/10)(2/9)(1/8) + (7/10)(6/9)(5/8)

= 6/720 + 210/720

= 216/720

= 3/10

prob(not the same colour) = 1 - 3/10 = 7/10

- math -
**chris**, Tuesday, September 25, 2012 at 11:12pmMany thanks!!!

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