There are six cards bearing numbers 2,4,5,5,5,6. If two cards are randomly selected from the lot, what is the probability that the difference between the numbers on these cards is 3 or less?
Possibilities that give you a difference of more than 3.
6-2 = 4
Total possibilities - 6C2 = 15.
All other combinations will have a difference of 3 or less.
So, (15-1)/15 = 14/15 IMO
