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紧急紧急Asaladbarhas7ingredients,excludingthedressingHowingmanydifferentsaladsarepossiblewheretwosaladsaredifferentiftheydon'tincludeidenticalingredients?答案是128
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A salad bar has 7 ingredients,excluding the dressing Howing many different salads are possible where two salads are different if they don't include identical ingredients?答案是128优质解答
是这样的：2个沙拉是不同的,如果他们是用不同原料制成的.也就是说,题目没有限定要用多少种材料做一份沙拉,及可以用1种也可以用2,3,4,5,6,7种.因此,.0C7+1C7+2C7+3C7+4C7+5C7+6C7+7C7=2的7次方=128 ,就可以得到128种了.
A salad bar has 7 ingredients,excluding the dressing Howing many different salads are possible where two salads are different if they don't include identical ingredients?答案是128
优质解答
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