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3. The hexadecimal additive inverse of 2F1025h of type DWORD is

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Answer #1

2F1025 ->
0010 1111 0001 0000 0010 0101
--------------------------------------------
1101 0000 1110 1111 1101 1010 . ==> D0EFDA

adding 1 to D0EFDA would give D0EFDB

If DWORD is 4 bytes in your compiler, answer would be trimmed to 4 bytes. i.e, FFD0EFDA

If DWORD is 8 bytes in your compiler, extra F's are appeneded to form 8 bytes. i.e, FFFFFFFFFFD0EFDA

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3. The hexadecimal additive inverse of 2F1025h of type DWORD is
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