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When making sets that do not include all the numbers that are possible (eg how many set of five can be made from eight dogs, or how many seven person sets can be made with nine people) when do you use nPr and when do you use nCr?

nkorigami  May 17, 2017
 #1
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Permutation: A set of objects in which position (or order) is 
important=nPr=68P5=1,250,895,360
Combination: A set of objects in which position (or order) is NOT 
important.=nCr=68C5=10,424,128

Guest May 17, 2017
 #2
avatar+14 
+1

Thank you!

nkorigami  May 17, 2017

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