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 less than 4?  Pick:
A) 1/45
B) 4/45
C) 1/15
D) 1/10
E) 1/5
The number of ways to choose two cards is 10C2=45.   There is only one way to get a sum less than 4.   P(sum less than 4)=1/45   The answer is 1/45.
<result>A</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 less than 4?