Hexadecimal numbers are a mixture of

The hexadecimal number system is a base-16 system, meaning it uses sixteen distinct symbols to represent values. Since the ordinary decimal digits \(0\) to \(9\) only provide ten symbols, six more are needed to reach sixteen.

Hexadecimal solves this by using the letters \(A\), \(B\), \(C\), \(D\), \(E\), and \(F\) to represent the values \(10\) to \(15\). So a full hexadecimal digit set is: \(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F\). This confirms that hexadecimal numbers are a mixture of letters and decimal digits.

It is easy to confuse hexadecimal with binary or octal because all three are alternative number bases used in computing, but binary uses only two symbols (\(0\) and \(1\)) and octal uses eight symbols (\(0\) to \(7\)); neither of these systems needs letters because their symbol counts fit within the ordinary digits.

Examination reminder: hexadecimal is the only common computing number base that must borrow letters to complete its symbol set, because base 16 exceeds the ten available decimal digits.