Gosh, you're slow.


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送交者: james_hussein_bond 于 2008-04-23, 23:10:36:

回答: if all seats were sold, of course there's not opportunity loss. 由 Enlighten 于 2008-04-23, 23:04:33:

I said "if the guy doesn't get the discount, he doesn't fly." Do you agree?

How many ways can this happen? (Hint: there can be empty seats.)




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