6.从5张100元,3张200元,2张300元的奥运预赛门票中任取3张,则所取3张中

6.从5张100元,3张200元,2张300元的奥运预赛门票中任取3张,则所取3张中至少有2张价格相同的概率为

A.                    B.                C.                 D.

答案

答案:C

解析:设所取三张中没有价格相同的概率为P1

P=1-P1=1-.

 


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