4*3*2=24(种) 4种荤菜设为a b c d ,3种蔬菜设为e f g ,2种汤设为h i 则24种为 1 a e h 2 a e i 3 a f h 4 a f i 5 a g h 6 a g i 7 b e h 8 b e i 9 b f h 10 b f i 11 b g h 12 b g i 13 c e h 14 c e i 15 c f h 16 c f i 17 c g h 18 c g i 19 d e h 20 d e i 21 d f h 22 d f i 23 d g h 24 d g i
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