This is the beginning of all probability problems.Memorize it: Probability = (number of ways to be successful) divided by (total number of possibilities) . When you draw one from a deck of cards, there are 52 total possibilities. How many red queens are there ? -- Queen of hearts-- Queen of diamonds There are two of them. Probability of drawing one from the deck = 2 / 52 = 1/26 = about 3.8% .
