Question

the 2's compliment of 15 is?
a)0
b)1
c)10
d)100
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Answer 1

01111

hope it helps

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Answer 2

1. +15 in 4 bit form in binary=1111
2. so 1111=0000 (1 is. replaced by 0)
3. add one to above number =0000+1=0001