这样计数,其实就是个六进制的问题
a.10C3 = 10*9*8 / 3!= 120
b.只要把99999换成六进制就行了,如果你在学discrete math,那就应该会转换(不会的话再问我),答案是2050543
(7)\x05By using the digits 0,1,2,3,4 and 5 John arranges the
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