Discussion
Using 16's complement method of subtraction compute CB2H - 972H :
Answer: C
CB2H - 972H = 340H.
In 16's complement subtraction, add the 16's complement of the subtrahend and discard the end carry. The 15's complement of 972 is FFF - 972 = 68D; adding 1 gives the 16's complement 68E.
\[ \begin{aligned} \text{CB2} + \text{68E} &= \text{1340} \\ \text{discard carry} &\Rightarrow \text{340H} \end{aligned} \]
Check in decimal: CB2H = 3250, 972H = 2418, and 3250 - 2418 = 832 = 340H. 68DH is only the 15's complement of the subtrahend, and 1340H is the sum before the end carry is dropped.
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