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Probability is likelihood of something happening in the future. It is expressed as an number between 0 and 1.
It can also be expressed as fraction, a decimal, a percent or as odd.
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Example: A bag contains 4 green and 3 red marbles. A marble is drawn 'at random'. What is the probability of drawing a red marble?
Solution: Random drawing of marbles ensures equally likely outcomes.
        Total number of outcomes = 4 + 3 = 7
Out of total 7 outcomes, favourable outcomes = 3, since the bag contains 3 red marbles.
        Hence, P(a red marble) = 3/7.

Example: One card is drawn from a well shuffled deck of 52 cards. Find the probability of getting a queen of red suit.
Solution: There are four queens in a deck of 52 playing cards but only those of heart and diamond are red. Hence,
        Number of favourable outcomes = 2
        Total number of possible outcomes = 52
        P(a king of red suit) = 2/52 = 1/26
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