求数学智者(会英语的那种!)An Ice-cream parlor sells sundaes with 3 different types of ice-cream and 4 different toppings.They have 8 flavors of ice-cream and 10 toppings for their customers to choose from.What is the probability that a
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![求数学智者(会英语的那种!)An Ice-cream parlor sells sundaes with 3 different types of ice-cream and 4 different toppings.They have 8 flavors of ice-cream and 10 toppings for their customers to choose from.What is the probability that a](/uploads/image/z/7130557-37-7.jpg?t=%E6%B1%82%E6%95%B0%E5%AD%A6%E6%99%BA%E8%80%85%EF%BC%88%E4%BC%9A%E8%8B%B1%E8%AF%AD%E7%9A%84%E9%82%A3%E7%A7%8D%21%EF%BC%89An+Ice-cream+parlor+sells+sundaes+with+3+different+types+of+ice-cream+and+4+different+toppings.They+have+8+flavors+of+ice-cream+and+10+toppings+for+their+customers+to+choose+from.What+is+the+probability+that+a)
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