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[组合] 求助（用3个数字1,2,3组成6位数）

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word3000 posted 2016-6-13 18:12 |Read mode

用3个数字1,2,3组成6位数，且1不相邻，则这样的6位数有多少？

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游客 posted 2016-6-13 20:13

64（没有1）+32X6（一个1）+16X10（2个1）+8X4（3个1）

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original poster word3000 posted 2016-6-13 21:03

谢谢

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