Q 12-14-040JEE MainJEE Main 2026 (5 Apr, Shift 1)Medium
For the given logic circuit, which of the following inputs combination will make both LED-1 and LED-2 to glow?
Answer: (C) $A = 1, B = 0, C = 1$
Concept. LED-1 shows $A+B$. LED-2 shows $(A+B)\cdot C\cdot A=AC$ (since $A=1$ already makes $A+B=1$).
Step 1. Conditions. Both glow when $A=1$ and $C=1$ (then $A+B=1$ too).
Step 2. Pick. $A=1$, $B=0$, $C=1$.
Answer. Option C.
Solution by Sreeraj P, M.Sc Physics
