A password for a website consists of 4 digits followed by 2 lowercase letters. Determine how many different passwords are possible if. 28. repetition of digits and letters is NOT allowed. a) 6,760,000 b) 3,276,000 c) 200,000 d) 6760 29. repetition of digits is permitted, and the letters must be 2 DIFFERENT vowels (a, e, i, o, u). a) 6,760,000 b) 3,276,000 c) 200,000 d) 6760 30. all 4 digits must be same, and the letters can be repeated. a) 6,760,000 b) 3,276,000 c) 200,000 d) 6760
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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