A check that tests whether the number of ones or zeroes in an array of binary digits is odd or even used to verify data storage and transmission. This is usually done by calculating the sum of the ” 1 ” bits in a data unit and determining if it is either an odd or even number. A binary digit (parity bit) is then added to a group of bits to make the sum of all the bits always odd (odd parity) or always even (even parity).

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