A set of pictures of butterflies contains 10 pictures. Jim bought 3 of the pictures. If 2 pictures are to be picked out from the 10 pictures, what is the probability that both pictures are not those that were already bought by Jim?
Choose the correct option
A) 14 / 15
B) 3 / 5
C) 6 / 13
D) 7 / 15
E) 7 / 10

Rationale: probability of first pick not one of the jim ' s picture is = 7 / 10 ( except for 3 which jim purchased ) probability of second pick not one of the jim ' s picture is = 6 / 9 total = 7 / 10 ∗ 6 / 9 = 7 / 15 answer is d option d
Answer: D