15 is # of combination of 4 numbers out of 6, 20 is 3 out of 6.
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谢谢。有点懂了。
-琼岛春荫-
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04/12/2012 postreply
09:32:00
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回复:15 is # of combination of 4 numbers out of 6, 20 is 3 out of
-Kamioka-
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04/12/2012 postreply
09:37:45
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回复:回复:15 is # of combination of 4 numbers out of 6, 20 is 3 out
-泥佛-
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04/12/2012 postreply
10:35:28
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I answered Q2 upstairs, please grade. :)
-Kamioka-
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04/12/2012 postreply
10:52:55
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and thanks for correcting the 20.
-Kamioka-
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04/12/2012 postreply
11:03:51