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It is easier to store data and instructions as a series of two-valued (binary) states. These may be holes or no holes in the cards or paper tapes of the 1960s and 70s, or magnetised and not magnetised states (for magnetic tapes), pits and no pits for CDs and so on.

It is possible, in theory , to store information as a set of different levels (of voltage or whatever) but these will degrade over time. The difference between two extreme values is the most robust and so carries the lowest risk of data corruption or errors.

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Q: Why does a computer use the binary number system?
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