可以把大人和小孩做组合,设大人为D,小孩为H
甲 乙 丙
1、{1D+1H},{1D+1H},{1D}有:(C31*C21)*(C21*C11)*C11=12
2、{1D+2H},{1D}, {1D}有:(C31*C22)*C21=6
3、{2D+1H},{1D,1H} 有:(C32*C21)*(C11*C11)=6
4、{1D+2H},{2D} 有:(C31*C22)*C22=3
共有:12+6+6+3=27种.
可以把大人和小孩做组合,设大人为D,小孩为H
甲 乙 丙
1、{1D+1H},{1D+1H},{1D}有:(C31*C21)*(C21*C11)*C11=12
2、{1D+2H},{1D}, {1D}有:(C31*C22)*C21=6
3、{2D+1H},{1D,1H} 有:(C32*C21)*(C11*C11)=6
4、{1D+2H},{2D} 有:(C31*C22)*C22=3
共有:12+6+6+3=27种.