1. Find the number m of ways that a class X with ten students can be partitions into four teams A1, A2, B1 and B2 where A1 and A2 contain two students each and B1 and B2 contain three students
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.
1. Find the number m of ways that a class X with ten students can be partitions into four teams A1, A2, B1 and B2 where A1 and A2 contain two students each and B1 and B2 contain three students
each.
2. At a dance, there are 20 girls and 20 boys. How many ways are there to form 20 pairs? How many if boys may dance with boys and girls with girls?
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