Edexcel Statistics S1 January 2012 Q2c : ExamSolutions

[eggsniffer]

If you worked it out by using the fact that P(A or B) = P(A) + P(B) - P(A & B) and then putting in values and rearranging to get P(A & B) = 5/36 and then did P(B) - 5/36 and got the right answer would you still get all the method marks and is it an acceptable method to reach the answer as it also works out to 5/12.

Just checking to make sure it wasn't just coincidence that it worked, thanks!