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1.取一個數:0,2,1,3 2.取兩個數: 末位是0時有3種 末位是1,2,3時各有2種 3.取三個數: 末位是0時有6種 末位是1,2,3時各有4種 4.取四個數: 末位是0時有6種 末位是1,2,3時各有4種 所以任取一個數是偶數的概率27/49
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