按题说明,应是计算“排列”.
A43 = 4!/(4-3)!= 24
C43 = 24
c52 = 5!/(5-2)!= 20
c65 = 6!/(6-5)!= 720
有关概率的公式
有关概率的公式
求A43,(4在下面,3在上面),C43,c52,c65.请顺便给出公式,
求A43,(4在下面,3在上面),C43,c52,c65.请顺便给出公式,
数学人气:982 ℃时间:2019-12-13 17:54:04
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