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Egg, 给你个小建议先：下次再POST GMAT题，写英文原题会避免产生歧义。：）

lazycow(---<-<<@)
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Last Updated: 2002-2-10
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GMAT题, 5个人跑步，A跑在B前面的概率是多少？（不考虑并列）
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