SAT 2 maths

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SAT 2 maths
A coin is tossed three times.given that at least one head appears.what is the probability that exactly two heads appear?
Answer 3/7 为什么不是3/8?

因为题目说至少有一面朝上了,所以排除掉三面都朝下的可能,就是3/7了

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