Checking my tree diagram for probability

[karush]

https://www.physicsforums.com/attachments/1163

well first want to see if i completed the tree diagram correctly
text in the boxes are mine.

 

[MarkFL]

In the rightmost column of probabilities, third from the top, you want 11/12 X 1/12 = 11/144. I can tell this is only a typo. Otherwise looks good.

 

[karush]

In the rightmost column of probabilities, third from the top, you want 11/12 X 1/12 = 11/144. I can tell this is only a typo. Otherwise looks good.

Yep typo, so is the answer for (b) just 11/144