1's complement of 11111011 is =00000100 Now, it's 2's complement =00000100 ‌‌‌+‌‌‌‌‌‌‌‌‌‌1 ‌‌‌─────── ‌‌‌‌‌00000101 ‌‌‌─────── Its Decimal equivalent
=1×22+0×21+1×20=4+0+1=5
From option 0 ; 1's complement of 00000110 is =11111001 Now, it's 2′ s complement =111110011 ‌‌‌‌+‌‌‌‌‌‌‌‌‌‌1 ‌‌‌─────── ‌‌‌‌‌‌11111010 ‌‌‌─────── Its decimal equivalent