1,2,3,4 这 4 个数字,能组成多少个互不相同的且无重复的三位数,都是多少?
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i = 0
for x in range(1,5):
for y in range(1,5):
for z in range(1,5):
if (x!=y) and (x!=z) and (y!=z):
i+=1
if i %4:
print("{}{}{}".format(x,y,z),end=" | ")
else:
print('{}{}{}'.format(x,y,z))