A control panel has 12 independent status LED indicators. To save power, the controller is designed such that exactly 2 LEDs are illuminated at any one time to represent a system state. What is the minimum number of bits required to represent all possible valid states of this control panel in binary?
666
777
888
121212
117 exam-style questions on Edexcel GCSE Computer Science Binary, covering Binary representation and number of states, Unsigned and two's complement integers, Converting denary and 8-bit binary, Binary addition and binary shifts, Concept of overflow, and Hexadecimal notation and conversion. Each one has a worked solution and a mark scheme showing where the marks go.