有7種原料可選（黃瓜、西紅柿、洋蔥等）,一共有多少種方法做沙拉,使得任意兩種沙拉都不相同（其實(shí)就是可以做出多少種不同的沙拉）?
答案是告訴你,每種原料都有放和不放兩種選擇（yes/no）,所以一共有2的7次方種不同的選擇.你知道,我不是學(xué)數(shù)學(xué)的,我有點(diǎn)忘了排列組合知識(shí),但是拿3和4做實(shí)驗(yàn),的確都是2的3次方和4次方.
【不過我覺得從實(shí)際出發(fā),答案應(yīng)該是127,因?yàn)槭裁丛隙疾环拧⒅环耪{(diào)料的就不是沙拉了.】
英語翻譯
英語翻譯
A salad bar has ingredients,excluding the dressing.How many different salads are possible where two salads are different if they don't include indentical ingredients?You can either include or exclude each of the seven ingredients in your salad,which means there are 2 choices for each ingredient.According to the multiplication rule,there are 2*7=128 ways of making these yes-no choices.原問題哪里來的include和exclude東西?
原題打錯(cuò)了A salad bar has 7 ingredients,excluding the dressing.How many different salads are possible where two salads are different if they don't include indentical ingredients?
A salad bar has ingredients,excluding the dressing.How many different salads are possible where two salads are different if they don't include indentical ingredients?You can either include or exclude each of the seven ingredients in your salad,which means there are 2 choices for each ingredient.According to the multiplication rule,there are 2*7=128 ways of making these yes-no choices.原問題哪里來的include和exclude東西?
原題打錯(cuò)了A salad bar has 7 ingredients,excluding the dressing.How many different salads are possible where two salads are different if they don't include indentical ingredients?
英語人氣：301 ℃時(shí)間：2020-05-21 03:58:26
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