hexadecimal to octal help please

who8myrice

Member
Apr 8, 2002
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hey guys for some reason i cannot figure out this problem, any help is appreciated!

In octal, the twelve-bit two's complement of the hexadecimal number 9DF is
(a) 3261
(b) 3041
(c) 3251
(d) 3512

i know the answer is B but i dont know why.