英语翻译
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.原问题哪里来的include和exclude东西?
原题打错了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?