Depending on how the question is asked
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送交者: outsider 于 2006-09-29, 18:13:34:
回答: 转一个微软的 brain teaser 由 匆匆过客 于 2006-09-29, 13:45:24:
1. How many planes do you have to have, each plane can take off and land multiple times, then answer is 4
2. If only counting taking off and landing, then answer is 6.
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