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排列組合的方法做的: 以0為結尾的偶數:C(5,1)*C(4,1)=5*4=20 以2結尾的偶數:C(4,1)C(4,1)=4*4=16 以4結尾的偶數:C(4,1)C(4,1)=4*4=16 總計:20+16+16=52個
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