Education Technology


Published on 07/27/2010

Activity Overview

Students are led through the development of the formula for finding n objects taken n at a time and n objects taken r at a time.

Key Steps

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    Students use their calculator to investigate factorials and the fundamental counting principle. They evaluate given expressions by using the factorial symbol "!".

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    In the next problem, students find the number of permutations of n objects taken n at a time.

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    Students go over the definition of a permutation and use the calculator to solve given expressions. They use the nPr command to find the number of permutations.