1/2 + 1/36 = 19/36 --- for one odd, one even number, plus (1, 1).
so the anser is:
19/36 - 1/9 = 5/12.
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回复:回复:回复:回复:5/36
-greenfarm-
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02/08/2010 postreply
10:13:27
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you are right. possibility for odd number is wrong
-pj-
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02/08/2010 postreply
14:09:53