问题描述：
一道SAT数学题,不太明白题的意思
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?
A D 1 4 7
B E 2 5 8
C F 3 6 9
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?
A D 1 4 7
B E 2 5 8
C F 3 6 9
问题解答：
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