the first and second coins are in the same direction Event : the second and third coins are in the same direction Event : the third and first coins are in the same direction = = = 2 4 = 1 2 5
coin are denoted by , . ∩ = ∩ = ∩ = , ∩ = 2 8 = 1 4 = 1 2 � 1 2 = i.e. and are independent. Similarly and are independent, and are also independent. hence, , and are pairwise independent . 6