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Weighed voting system
To determine a voter's power using the Banzhaf index, first list all of the winning coalitions, then count the crucial voters. A crucial voter is one whose vote, if altered from yes to no, would cause the proposition to fail. The proportion of all swing votes that a voter could cast is used to calculate his voting power.
Number of coalitions for which the players are critical (Banzhaf power distribution)
Critical count for P1 =3
Critical count for P2 =1
Critical count for P3 =1