A dyadic rational has the form . Its terminating binary expansion has an alternative expansion ending in infinitely many digits.
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A binary number is a number expressed in the base-2 numeral system, which uses only two digits: 0 and 1. In contrast to the decimal system (base-10), which uses ten digits (0-9), binary is the foundation of digital computing and electronic systems. Each digit in a binary number is referred to as a "bit.