6 is right, you said how many planes need to provide gas for 1
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送交者: wavelet 于 2006-09-29, 14:22:00:
回答: it's close - maybe you didn't count the one that finishes cirlcling the globe in 由 匆匆过客 于 2006-09-29, 14:16:33:
Therefore, 3 on the start direction of the circle, and another 3 on the opposite direction. So, totally 6 planes needed to support one plane to finish the circle.
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