Q1,paper 2,Dec 12. Consider the circuit shown below. In a certain steady state, Y is at logical ‘l’. What are possible values of A, B,

(A) A = 0, B = 0, C = 1
(B) A = 0, B = C = 1
(C) A = 1, B = C = 0
(D) A = B = 1, C = 1
Answer(A)
Explanation.
Let y=1 , take option 1. When A=0, output of first nand gate is 1. Then out put at second nand gate is 1. When c=1 then out at AND gate will be 1. Which verifies the equation.