A coin is biased so that the head is 3 times likely to occur as tail. If the coin is tossed twice, then the probability distribution of number of tails is :

x 0 1 2 P(x) 9/16 6/16 1/16   x 0 1 2 P(x) 9/16 1/16 6/16   x 0 1 2 P(x) 1/16 6/16 9/16 x 0 1 2 P(x) 1/16 9/16 6/16

x 0 1 2 P(x) 9/16 6/16 1/16