概率问题(混合排列与组合)A和B还有其他8个学生以2人1行,共5行的方式被安排排列在一起照相,求A站在B前面或者背后的概率.A ,B and 8 other students are arranged in 5 rows of 2 in order to take a photography,f
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![概率问题(混合排列与组合)A和B还有其他8个学生以2人1行,共5行的方式被安排排列在一起照相,求A站在B前面或者背后的概率.A ,B and 8 other students are arranged in 5 rows of 2 in order to take a photography,f](/uploads/image/z/8786666-2-6.jpg?t=%E6%A6%82%E7%8E%87%E9%97%AE%E9%A2%98%EF%BC%88%E6%B7%B7%E5%90%88%E6%8E%92%E5%88%97%E4%B8%8E%E7%BB%84%E5%90%88%EF%BC%89A%E5%92%8CB%E8%BF%98%E6%9C%89%E5%85%B6%E4%BB%968%E4%B8%AA%E5%AD%A6%E7%94%9F%E4%BB%A52%E4%BA%BA1%E8%A1%8C%2C%E5%85%B15%E8%A1%8C%E7%9A%84%E6%96%B9%E5%BC%8F%E8%A2%AB%E5%AE%89%E6%8E%92%E6%8E%92%E5%88%97%E5%9C%A8%E4%B8%80%E8%B5%B7%E7%85%A7%E7%9B%B8%2C%E6%B1%82A%E7%AB%99%E5%9C%A8B%E5%89%8D%E9%9D%A2%E6%88%96%E8%80%85%E8%83%8C%E5%90%8E%E7%9A%84%E6%A6%82%E7%8E%87.A+%2CB+and+8+other+students+are+arranged+in+5+rows+of+2+in+order+to+take+a+photography%2Cf)
概率问题(混合排列与组合)A和B还有其他8个学生以2人1行,共5行的方式被安排排列在一起照相,求A站在B前面或者背后的概率.A ,B and 8 other students are arranged in 5 rows of 2 in order to take a photography,f
概率问题(混合排列与组合)
A和B还有其他8个学生以2人1行,共5行的方式被安排排列在一起照相,求A站在B前面或者背后的概率.
A ,B and 8 other students are arranged in 5 rows of 2 in order to take a photography,find the probability that A and B are standing in front of or behind each other .
Answer :8/45
概率问题(混合排列与组合)A和B还有其他8个学生以2人1行,共5行的方式被安排排列在一起照相,求A站在B前面或者背后的概率.A ,B and 8 other students are arranged in 5 rows of 2 in order to take a photography,f
C(4,1)*C(2,1)/C(10,2)=4*2/45=8/45