1,2,3,4可以组成多少种3位数

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[Python] 纯文本查看 复制代码

sum = 0
for i in range(1, 5):
    for j in range(1, 5):
        for k in range(1, 5):
            if i != j and j != k and i != k:
                print(i, j, k)
                sum += 1
print("共", sum, "种")