Here's the question you clicked on:
CBass2015
You are playing a gambling game with a pirate in which you roll two fair six - sided dice. If the sum of the dice is a prime number, then you must walk the plank ... and you can’t swim! If you manage to avoid the plank, there’s a 1/13 chance that the pirate will behead you with his sword. What is the probability that you will survive?
did you draw a tree diagram?
P(survive) = p(~prime) * P(~beheaded | ~prime)
Oh I did not. Thanks for the diagram!