Explanation Definition: A permutation is an ordering of distinct objects. If we select r different objects from a set of n objects, and arrange them in order, this is called a permutation of n objects taken r at a time. The number of permutations of n objects taken r at a time is denoted by P ( n , r ) . Formula for computing P ( n , r ) = n ! ( n − r ) ! Calculation: Given, Annette has rented a summer house for next semester. She wants to select four roommates from a group of six friends. For get the number of ways we use the permutations. P ( 6 , 4 ) Using the formula for permutations. P ( n , r ) = n ! ( n − r ) ! Here, n = 6 and r = 4

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Author: Tom Pirnot

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Chapter 12.3, Problem 34E

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The number of ways can she select to four roommates from a group of six friends.

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Chapter 12.3, Problem 33E

Chapter 12.3, Problem 35E

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The number of ways can she select to four roommates from a group of six friends.

Solution Summary: The author explains how Annette can select four roommates from a group of six friends. The number of permutations is denoted by P(n,r).

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To find: The number of ways can she select to four roommates from a group of six friends.

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Chapter 12 Solutions

To find:

The number of ways can she select to four roommates from a group of six friends.