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what is npr and ncr?

Guest Apr 7, 2015

Best Answer 

 #3
avatar+93289 
+10

P stands for permutations and C stands for combinations.

Here is a introductory video clip on combinations and permutation.

https://www.youtube.com/watch?v=hJRXKq2GEo8

 

3C2 means how many combinations of 2  can you get from 3 objects   I'll call them  A,B,C

Well you can get  AB, AC, or BC  so    3C2=3

3P2 means how many permutations of 2  can you get from the 3 objects 

Well with permutations order counts so you can have

AB or BA, AC or CA, BC or CB      SO     3P2=6

 

nCr means how many combinations of r objects can you take from n objects.

nPr means how many permutations of r objects can you take from n objects.     

Melody  Apr 7, 2015
 #1
avatar+17 
+8

NPR stands for National Public Radio and NCR is a computer company.

JohnJohn  Apr 7, 2015
 #2
avatar
+5

Good one JJ.

We have a new troll in the making.

Guest Apr 7, 2015
 #3
avatar+93289 
+10
Best Answer

P stands for permutations and C stands for combinations.

Here is a introductory video clip on combinations and permutation.

https://www.youtube.com/watch?v=hJRXKq2GEo8

 

3C2 means how many combinations of 2  can you get from 3 objects   I'll call them  A,B,C

Well you can get  AB, AC, or BC  so    3C2=3

3P2 means how many permutations of 2  can you get from the 3 objects 

Well with permutations order counts so you can have

AB or BA, AC or CA, BC or CB      SO     3P2=6

 

nCr means how many combinations of r objects can you take from n objects.

nPr means how many permutations of r objects can you take from n objects.     

Melody  Apr 7, 2015

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