How to find end state probabilities of a state transition probability matrix?

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Given I have a state transition matrix where we move from state to state by the roll of a die, with 13 in-game states plus states 14, 15 are the two end game states (14 one outcome, 15 another), how do I compute the total probability that say 14 will happen? If I sum the column 14 and 15 shouldn't it come to 1? There are also the following properties: we do not move backward and we can only visit a state one time.

image of matrix