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因為是偶數,所以個位是2或4; 當是一位數時,就2種; 當是二位數時,種數=2×3=6種; 當是三位數時,種數=2×3×2=12種; 當是四位數時,種數=2×3×2×1=12種; 所以一共種數=2+6+12+12=32個; 如果本題有什麼不明白可以追問,
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