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Assume the operands are in 2’s Complement. To decrement A by 1, lines K,Cn and B should be :

1. K = 1 , Cin = 1 , B = 1
2. K = 0 , Cin = 1 , B = 1
3. K = 0 , Cin = 1 , B = 0
4. K = 1 , Cin = 0 , B = 0

edited | 158 views

by Junior (735 points)
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Explain brother
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Its Option D
+1

This is the result i didn't understood last one

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do by logic , let A2A1 = 11 means -1 in 2s complement , so we should get the result -2 i.e S2S1 = 10 by applying the inputs now put all th inputs u will get D as the result
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we can take any number like 11,10,01 it is in 2's complement number  in the form of  A2A1 now apply hit and trial for all option only option(d) is satisfy.

+1 vote