Binary substraction using 2's complement.

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Binary substraction using 2's component method is performed as follows
(i) The 2's complement of the binary number to be subtracted is added to the number from which subtraction to be done.
(ii) If the carry in the last position of the sum is 1 then it is dropped and the result is positive.
(iii) If there is no carry in the last position of the sum then the 2's complement of the sum is the final result and it is negative. 

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