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A binary number can be represented by any sequence of bits (binary digits), which in turn may be represented by any mechanism capable of being in two mutually exclusive states.
In a computer, the numeric values may be represented by two different voltages; on a magnetic disk, magnetic polarities may be used.
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Device
- A memory device called 'D-Latch' can holds a binary 'bit'. See Simple CPU. It's how a computer store data.