How many non zero digits are there in the hexadecimal number system?1.152.103.84.165.None of these

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How many non zero digits are there in the hexadecimal number system?1.152.103.84.165.None of these
How many non zero digits are there in the hexadecimal number system?
1.15
2.10
3.8
4.16
5.None of these

How many non zero digits are there in the hexadecimal number system?1.152.103.84.165.None of these
题目的意思是:十六进制系统中有多少个不含0的数字?
表示十六进制的数字为:1,2,3,4,5,6,7,8,9,A,B,C,D,E,F.其中并没有10,所以不含0的数字有15个.

5