Q. 3 professors and 3 students are sit in a row (i) How many seating arrangements are there?, (ii) How many seating arrangements if the professors sit just together and students sit just together. (iii) How many seating arrangements are there if the professors and the students sit together? (iv) How many seating arrangements are there if the professors and the students must alternate? (v) How many seating arrangements are there if only the professors must sit together?
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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