Question

Find both the number of combinations and the number of permutations for 10 objects taken 4 at a time. Express your answer in exact simplest form. There are ___ combinations and ___ permutations.

          Find both the number of combinations and the number of permutations for 10 objects taken 4 at a time. Express your answer in exact simplest form.
There are ___ combinations and ___ permutations.
        

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Elementary Statistics a Step by Step Approach
Elementary Statistics a Step by Step Approach
Allan G. Bluman 9th Edition
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Find both the number of combinations and the number of permutations for 10 objects taken 4 at a time. Express your answer in exact simplest form. There are ___ combinations and ___ permutations.
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Transcript

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00:01 In this problem, we have been asked to determine the number of permutations possible of 10 things taken 2 at a time.
00:09 So, first of all, recall the formula to determine the number of permutations of n things taken r at a time.
00:19 Now, the formula for npr is n factorial divided by n minus r factorial.
00:27 Now, in this case, we need to determine the number of permutations of 10.
00:31 Things taken two at a time.
00:34 So n is 10 and r is 2...
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