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  • In sign magnitude, zero is represented in 2 ways so we have one less number that can be represented. Double representation can also cause problems when comparing numbers; numbers may be the same but look different.
  • Addition and subtraction are very easy in 2's complement. To compute 6-2, we just add 6 to -2 using normal addition dropping the leftmost carry bit if there is any carry:

01102 = 6

11102 = -2

---------------

01002 = 4

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Q: What are the advantages of 2's complement?
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