Consider the weighted voting system [15: 11, 7, 5, 2]

In the coalition {$\displaystyle {P}_{{1}},{P}_{{2}},{P}_{{4}}$} which players are critical?

Critical players =

Identify players by their number only. For example, if the answer is $\displaystyle {P}_{{1}}$ and $\displaystyle {P}_{{2}}$, enter 1,2