In the hexadecimal number system, which characters are used to represent values 10-15?

• A. Binary number system
• B. Decimal number system
• C. Octal number system
• D. Hexidecimal number system

Answer: (D)

In the hexadecimal system, each value above 9 needs a distinct symbol, and the base is 16. To represent values 10 through 15, the symbols used are A, B, C, D, E, and F. That’s why hexadecimals are written with digits 0–9 for values 0–9 and letters A–F for 10–15. The other bases use different sets of symbols: binary uses 0 and 1, decimal uses 0–9, and octal uses 0–7. So the concept being tested is that hexadecimal expands beyond digits by using letters A–F to represent 10–15.