Question

Which of the following bit patterns represents the value -9 in two’s complement notation?

A. 00011010 B. 11110111 C. 10001001 D. 11111011

Answer 1

B. 11110111

Step-by-step explanation:

Binary representation of number 9 = 00001001

Binary representation of -9 would involve calculating the twos complement representation of 00001001

First we compute the ones complement of this number by reversing the bits.

00001001 => 11110110

Next we calculate the twos complement representation by adding 1 to the ones complement.

11110110+1 = 11110111

So the final representation is 11110111.