3 views

The output $\mathrm{Y}$ in the circuit below is always $\text{“1"}$ when

1. two or more of the inputs $\mathrm{P, Q, R}$ are $\text{“0"}$
2. two or more of the inputs $\mathrm{P, Q, R}$ are $\text{“1"}$
3. any odd number of the inputs $\mathrm{P, Q, R}$ is $\text{“0"}$
4. any odd number of the inputs $\mathrm{P, Q, R}$ is $\text{“1"}$