5) How many different passwords are possible? If a cell phone's password consists of eight characters, first character is an even number selected from the digits of your college ID, the next six characters selected from the English alphabet and the last character is an odd number selected from the digits of your college ID. For example, if your MEC ID is 13F15320, then your ID involve seven digits 0, 1, 2, 3, 5
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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