Discussion
The 15's complement of A9BH is :
Answer: D
The 15's complement of A9BH is 564H.
The 15's complement in hexadecimal is the analogue of the 1's complement in binary: subtract every digit from F (15).
\[ \begin{aligned} F - A &= 15 - 10 = 5 \\ F - 9 &= 15 - 9 = 6 \\ F - B &= 15 - 11 = 4 \end{aligned} \]
So the result is 564H. As a check, A9B + 564 = FFF. Adding 1 to the 15's complement would give the 16's complement, 565H, which is not offered; the other options do not add to FFF with A9B.
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