There are 1200 elephants in a herd. Some have pink and green stripes, some are all pink and some are all blue. One third are pur

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问题 There are 1200 elephants in a herd. Some have pink and green stripes, some are all pink and some are all blue. One third are pure pink. Is it true that 400 elephants are definitely blue?

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答案No.

解析 (其他800头大象可以是蓝色条纹,或是粉绿相间的条纹。)  
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