Cab怎么求
组合计算里的Cab =Pab÷b! 例如: C85 =P85÷5! =8x7x6x5x4÷(5x4x3x2x1) =6720÷120 =56
组合计算里的Cab =Pab÷b! 例如: C85 =P85÷5! =8x7x6x5x4÷(5x4x3x2x1) =6720÷120 =56
组合计算里的Cab =Pab÷b! 例如: C85 =P85÷5! =8x7x6x5x4÷(5x4x3x2x1) =6720÷120 =56
组合计算里的Cab =Pab÷b! 例如: C85 =P85÷5! =8x7x6x5x4÷(5x4x3x2x1) =6720÷120 =56