1) This question considered permutations of "RONALDMCDONALD". (a) How many permutations are there total? (b) How many permutations start and end with vowels? (c) How many permutations do NOT have consecutive vowels in them? (d) How many permutations contain the vowels in order (all As before all Os)? (e) How many permutations contain the substring “OLAND"? (Note: This one is hard!)
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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