Consider a Little League team that has 15 players on its roster. (a) How many ways are there to select 9 players for the starting lineup? (b) How many ways are there to select 9 players for the starting lineup and a battingorder for the 9 starters? (c) Suppose 5 of the 15 players are left-handed. How many ways are there to select3 left-handed outfielders and have all 6 other positions occupied by right-handedplayers?
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.
Consider a Little League team that has 15 players on its roster.
(a) How many ways are there to select 9 players for the starting lineup?
(b) How many ways are there to select 9 players for the starting lineup and a battingorder for the 9 starters?
(c) Suppose 5 of the 15 players are left-handed. How many ways are there to select3 left-handed outfielders and have all 6 other positions occupied by right-handedplayers?
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