A certain bookstore sells only 10 different titles of books. A customer buys 3 different titles out of 10 titles of books offered by the store. Another customer walks into the store and randomly picks 2 different titles of books. What is the probability that the second customer picks the titles that the first one didnt?
A.7/35
B.7/15
C.15/35
D.28/60
E.14/15
OA will come later! I need a detailed explanation.
A.7/35
B.7/15
C.15/35
D.28/60
E.14/15
OA will come later! I need a detailed explanation.
Last edited by Ozlemg on Mon Jul 04, 2011 7:06 am, edited 1 time in total.
The more you suffer before the test, the less you will do so in the test! 
