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% .
