问题描述：
sat数学概率题
If the rating system shown is used,how many different combinations of driver and passenger protection ratings is it possible for a car to recieve?
我用的A52
5乘以4等于20,
可答案是25怎么错了?
If the rating system shown is used,how many different combinations of driver and passenger protection ratings is it possible for a car to recieve?
我用的A52
5乘以4等于20,
可答案是25怎么错了?
问题解答：
我来补答展开全文阅读