If you select two cards from a pile of cards numbered 1 to 10, what is the probability that the sum of the numbers is more than 18? Choose the correct choice from the following answers:
A) 1/5 B) 1/15 C) 2/15 D) 1/45 E) 2/45
The number of ways to choose two cards is 10C2=45.   There is only one way {9, 10} to get a sum more than 18.   P(sum more than 18)=1/45   The answer is 1/45.
<result>D</result>
If you select two cards from a pile of cards numbered 1 to 10, what is the probability that the sum of the numbers is more than 18?