I think we should change 16 to 20....we get C(24,4)=...
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how to understand: must be invested among 4 possible opportuniti
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09/08/2010 postreply
10:00:33
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even if we should change 16 to 20....we get C(21,4)=...
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09/08/2010 postreply
10:03:46
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sorry, C(21,4)=... wrong; C(24,4)=... right,if we should change
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09/08/2010 postreply
10:07:18