Figure gives a system of logic gates. From the study of truth table it can be found that to produce a high output (1) at R, we must have –
Answer & explanation
Correct answer: option 3
* Out put R = X $\bar Y$
* If R = 1 it is possible when X = 1 & Y= 0
$Y = \overline{\bar A.\bar B} = A + B$ i.e. OR gate