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A525乘以4等于20,可答案是25怎么错了?
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![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A525乘以4等于20,可答案是25怎么错了?](/uploads/image/z/5432214-30-4.jpg?t=sat%E6%95%B0%E5%AD%A6%E6%A6%82%E7%8E%87%E9%A2%98If+the+rating+system+shown+is+used%2Chow+many+different+combinations+of+driver+and+passenger+protection+ratings+is+it+possible+for+a+car+to+recieve%3F+%E6%88%91%E7%94%A8%E7%9A%84A525%E4%B9%98%E4%BB%A54%E7%AD%89%E4%BA%8E20%2C%E5%8F%AF%E7%AD%94%E6%A1%88%E6%98%AF25%E6%80%8E%E4%B9%88%E9%94%99%E4%BA%86%3F)
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