How many binary digits are needed to represent all 16 hexadecimal symbols? 

The correct answer is Four.

Key Points

• Each hexadecimal digit can be represented by 4 binary digits (bits).
• The hexadecimal system is base-16, which includes the digits 0-9 and the letters A-F.
• Binary system is base-2, which includes only the digits 0 and 1.
• To convert a hexadecimal digit to binary, each hex digit is mapped to a 4-bit binary equivalent.

Important Points

• The hexadecimal numeral system is widely used in computing and digital electronics because it is more compact than binary.
• One hexadecimal digit represents four binary digits (bits), making it easier to read and interpret large binary numbers.