排列组合法可以解决下面请选择CBA9u7i:|9[7_0~-]0S,G7~2^(F)r)K;e+q/`6}
A.安排作息时间0S,G7~2^(F)r)K;e+q/`6}
B.算出算式的积0S,G7~2^(F)r)K;e+q/`6}
C.统计几个人相互能握几次手0S,G7~2^(F)r)K;e+q/`6}