A Canadian postal code consists of a series of six characters of which three are letters and three are digits, it begins with a letter and each letter is followed by a single digit. (To make it easier to read, the series is broken into sequences of three. For example, B3H 3J5 is a valid zip code). How many Canadian zip codes are possible?
Permutations and Combinations
If there are 5 dishes, they can be relished in any order at a time. In permutation, it should be in a particular order. In combination, the order does not matter. Take 3 letters a, b, and c. The possible ways of pairing any two letters are ab, bc, ac, ba, cb and ca. It is in a particular order. So, this can be called the permutation of a, b, and c. But if the order does not matter then ab is the same as ba. Similarly, bc is the same as cb and ac is the same as ca. Here the list has ab, bc, and ac alone. This can be called the combination of a, b, and c.
Counting Theory
The fundamental counting principle is a rule that is used to count the total number of possible outcomes in a given situation.
A Canadian postal code consists of a series of six characters of which three are letters and three are digits, it begins with a letter and each letter is followed by a single digit. (To make it easier to read, the series is broken into sequences of three. For example, B3H 3J5 is a valid zip code). How many Canadian zip codes are possible?
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