x+y+z=12(x=1-6 y=1-6 z=1-6)
问题描述:
x+y+z=12(x=1-6 y=1-6 z=1-6)
有多少种排列?
可以的话能不能教下我怎么算比较容易算?
答
165,156,
246,255,264,
336,345,354,363,
426,435,444,453,462,
516,525,534,543,552,561,
615,624.633.642.651