(a) What is a permutation of r elements of a set? How many permutations are there of n objects taken r at a time?
(b) In how many different ways can a president, vice-president, and secretary be selected from a group of 15 students?
The permutation of elements of a set, and find number of permutation of objects taken at a time.
A permutation of a set of object is an ordering of these objects. If the set has objects, then there are permutations of the objects.
If a set has objects, then the number of ways of ordering the elements subset of the set is denoted and is called the number of permutation of objects taken at a time and given by,
The number of ways to choose president, vice-president, and secretary from a group of students.
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