I have answered this type of question before but the 2 times is tripping me up. I keep getting the wrong answer by a few numbers.

There are 52 white keys and 36 black keys on a standard piano. What is the probability that if a person did not look and hit the keyboard twice that he or she would first hit a white key and then hit a black key?

Question

I have answered this type of question before but the 2 times is tripping me up. I keep getting the wrong answer by a few numbers. 

There are 52 white keys and 36 black keys on a standard piano.  What is the probability that if a person did not look and hit the keyboard twice that he or she would first hit a white key and then hit a black key?

anonymous · Answer

That's 88 total so you'd do 52/88 times 36/88 (although the white keys are bigger so it's probably not equally likely that she would hit a white key or a black key)