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what is the answer of this data?

Posted by ccnuzhang at 2008-05-17 17:09:48 on Problem 3532
3 3
1 2 1
1 3 1
2 3 1

0.66? or 0.67? or ?

4 6
1 2 1
1 3 1
1 4 1
2 3 1
2 4 1
3 4 1

what about this?

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