In a room three switches S1,S2, S3 are arranged in a such way that in logical expression given below if switch S1 is OFF, S2 is ON, switch S3 is ON state whether the room is lighted or not? (Here S1, S2 and S3 represents statement p, q and r respectively) [(~p^q)v(p^q^r)v(p^~q)]v(~r)