순서나열시,4x3x2x1=24가지 1245,1254,1425,1452,1524,1542, 2145,2154,2415,2451,2514,2541, 4125,4152,4215,4251,4512,4521, 5124,5142,5214,5241,5412,5421.
당신은 어느 그룹입니까?