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even if we should change 16 to 20....we get C(21,4)=...
皆兄弟也
2010-09-08 10:03:46
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皆兄弟也
2010-09-08 10:07:18
sorry, C(21,4)=... wrong; C(24,4)=... right,if we should change
皆兄弟也
2010-09-08 10:07:18sorry, C(21,4)=... wrong; C(24,4)=... right,if we should change