In my answer to question 1 in Part B of Practise Exam A, I accidentally wrote "CC" for the third member of the sample space when I meant to write "CG".  So, in part (a), the third element should be CG but the probability is correct at .15.

 

However, that led me to answer part (c) incorrectly, as only four of the elements are where X = 0.

 

SS, CS, SC and CC at the end.  Adding those four probabilities up:

 

P(X = 0) = .42

 

I accidentally added the .15 on to that because of my error in writing CC when I meant CG.