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This is used due to the extreme simplicity of binary numbers (take a look at the addition table, and at the multiplication table, for binary numbers). This makes it much simpler to design circuits to do the calculations. Also, it is usually simpler, and safer, to distinguish two different states (for example, a high and a low voltage, to represent 1 and 0, respectively), than to distinguish ten different states.

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6y ago

The main reason is that binary codes are robust. That is to say, an electromagnetic charge is either there or not there and a machine can easily and unambiguously determine which. For a computer to work on the decimal system, you would need to have ten different levels of charge. That would either require a very large range of values for the charges so that the charge for the highest digit would be very high, or very small difference between charges for individual digits. In the first case the energy requirement of computers would be very large and in the second case, small degradation in charge, over time, would make errors more likely.

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Q: Why do todays computers only understand Binary code 0 and 1?
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