- -a snack machine has buttons arranged as shown above if a selection is made by choosing a letter followed by a one-digit number,what is the greatest number of different selections that could be made?答案是54,为什么 = =

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- -a snack machine has buttons arranged as shown above if a selection is made by choosing a letter followed by a one-digit number,what is the greatest number of different selections that could be made?答案是54,为什么 = =
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a snack machine has buttons arranged as shown above if a selection is made by choosing a letter followed by a one-digit number,what is the greatest number of different selections that could be made?
答案是54,为什么 = =

- -a snack machine has buttons arranged as shown above if a selection is made by choosing a letter followed by a one-digit number,what is the greatest number of different selections that could be made?答案是54,为什么 = =
快餐机器按钮安排如上所示.如果一个选择是由选择一个字母,紧随其后的是一个一位数号码,则最多有几种选择?
6*9=54

我不知道你是几年级。这其实是一个分步问题。第一步从字母当中任选一字母，第二步从数字当中任选一个数字，使之组成一个字母数字对，比如A1，这样的不同组合最多有多少个，分明是6*9=54吗。不知你满意不？

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