练习一：数学计算

题目:有四个数字，分别是1,2,3,4，请问可以组成多少个相互不重复的数字，各是多少

count = 0
list1 = []
for x in range(1,5):
    for y in range(1,5):
        for z in range(1,5):
            if x != y and y != z and x != z:
                count += 1
                m = str(x)+str(y)+str(z)
                list1.append(m)
print(count)
print(list1)

答案：

24
['123', '124', '132', '134', '142', '143', '213', '214', '231', '234', '241', '243', '312', '314', '321', '324', '341', '342', '412', '413', '421', '423', '431', '432']