Q43,paper 2,J 13. Which one of the following is decimal value of a signed binary number 1101010, if it is in 2’s complement form ?

(A) – 42

(B) – 22

(C) – 21

(D) – 106.

Answer B.

Explanation.

Number  is 1101010.

I’s complement is 0010101.

2’s complement is 0010110=16+4+2. =22.