Suppose a company needs temporary passwords for the trial of a new payroll software. Each password will have one digit followed by three letters. The letter G and the digits 2, 3, 4, and 5 will not be used. So, there are 25 letters and 6 digits that will be used. Assume that the letters can be repeated. How many passwords can be created using this format? | passwords
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.
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