Question

1001 is a data presented on a set of binary coded decimal output lines. What would be the decimal equivalent of this number in the case of negative logic?

(a) 9

(b) 6

(c) 1

(d) 8

I got this question at a job interview.

I need to ask this question from Digital Circuits in section Digital Circuits of Analytical Instrumentation

Answer 1

Right answer is (b) 6

For explanation I would say: The decimal equivalent of the number 1001 in the case of negative logic is 6. In the case of positive logic, the decimal equivalent will be 9.