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The ones' complement of a binary number is the value obtained by inverting (flipping) all the bits in the number (that is, changing each 1 to a 0 and each 0 to a 1). The name "ones' complement" refers to the fact that such an inverted value, if added to the original, would always produce an "all ones" number (the term "complement" refers to such pairs of mutually additive inverse numbers, here in respect to a

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