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when to use nPr or nCr?
i get confused between which one i should use, could someone explain to me the difference between the 2, and an example?
4 Answers
- Alam Ko IyanLv 71 decade agoFavorite Answer
you use nPr, when you want to take note of the order.
Example, in choosing between A,B,C,D & E , how many ways can you choose any 3 arranged letters. (This means ABC is different from ACB or BCA or...)
Then 5P3.
you use nCr , when the order is not important.
Example , how many ways can you get three letters from A,B,C,D & E. (here ABC is no different from BAC since you just got A&B&C.)
Then 5C3.
d:
- leoLv 61 decade ago
nPr is when order matters
nCr is when order does not matter
lets take the lottery
if we are picking the daily number (order matters so nPr)
if we box the number (order does not matter so nCr)
Source(s): http://www.mathassignment.com/ - Anonymous5 years ago
The difference is if order matters or not.
