将4名大学生分配到3个乡镇去当村官，每个乡镇至少一名，则不同的分配方案有（ ）种．
A．26
B．36
C．42
D．81
根据题意，4名大学生分配到3个乡镇，要求每个乡镇至少一名，则必须向一个乡镇分派2名，其他的两个乡镇各分派1名大学生，
则将4名大学生分成3组，共有C42=6种分组方法，
再将这3组分别对应3个乡镇，有A33=6种方法，
则不同的分配方法共有6×6=36种，
故选B．
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