GRE

简答题 If-1<mn<0，then which of the following can be true?

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B．It is not possible for m and n to be both negative or both positive，because this would make mn>0．which is not the case．This rules out m<0 and r/<0．m>1 and n>1，and-1<m<0 and r/<0．Furthermore，m>1 and n<-1 is not possible because then the product mn would be less than-1，which is also not the case．Thus m<1 and n<1 is the only possibility which could be true．

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