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lw_19810512:10^5 + 10^4*24*5 + 10^3*24^2*C(5,2) 的总和是多少呀 (2017-01-17 12:57)
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实在:2*34*34*34*34=267万 (2017-01-17 12:46)
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torius:黄牌和蓝牌是两套独立体系,也就是说,允许出现编号完全相同的两张号牌,一蓝一黄。现实中我也发现过。 (2017-01-17 13:04)
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