SOLUTION: A person selects 5 letters from the word "Combine" & arranges them. How many ways can they do this?
When I did the problem I used n C r (7 C 5 ) but when I checked my answer
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When I did the problem I used n C r (7 C 5 ) but when I checked my answer
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Question 978798: A person selects 5 letters from the word "Combine" & arranges them. How many ways can they do this?
When I did the problem I used n C r (7 C 5 ) but when I checked my answer in my notes, I put nPr
(7 P 5) , but I don't understand why. Please explain why using nPr is the correct way to go about this problem. Answer by jim_thompson5910(35256) (Show Source):
You can put this solution on YOUR website! Order matters. Something like "combi" is different from "icomb". That's why nPr is used instead of nCr.
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