Gaokao Math Practice Question
5. (5 分) 若某群体中的成员只用现金支付的概率为 0.45 , 既用现金支付也用非 现金支付的概率为 0.15 , 则不用现金支付的概率为 $($ )
- A.0.3
- B.0.4
- C.0.6
- D.0.7
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