Design a logical circuit to be part of a 3-person voting

Question

Design a logical circuit to be part of a 3-person voting system. The "Yes" light turns ON only if the majority has pressed on the "Vote" button.

1. Generate its Truth table.
2. Drive its POS & SOP expressions.
3. Simplify the SOP using Boolean algebra to obtain the following expression.
4. Simplify the POS using Boolean algebra to obtain the same expression in (3).
5. Draw the corresponding logic diagram.