a coin is tossed twice if the coin shows head it is tossed again but if it shows a tail then a die is tossed. if 8 possible outcomes are equally likely.find the probability that the die shows a no. greater than 4,if it is known that the first throw of the coin results in a tail.

1) 1/3
2) 2/3
3) 2/5
4) 4/15