Computer Science for IGCSE & O level - Data Representation (Section 11 - No. 19)
Which of the following is NOT a key number system used in computer science?
Binary
Decimal
Hexadecimal
Octal
Vysvetlenie
The key number systems used in computer science are binary, hexadecimal, and sometimes octal. Decimal is the standard base-10 system we commonly use, but it is not a fundamental system within computers.