Math

[nixon13]

can someone write out the equations for nCr and nPr please?

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[klutzy1987]

can someone write out the equations for nCr and nPr please?

NcR= N!/((N-R)!R!)
NpR=N!/(N-R)!

 

[nixon13]

what do n an r mean exactly and do u have an example?

 

[klutzy1987]

what do n an r mean exactly and do u have an example?

4 people interviewing for 3 jobs how many different ways. (order counts)
N=4
R=3
4p3=4!/(4-3)!=24

 

[IWantH2O]

4 people interviewing for 3 jobs how many different ways. (order counts)
N=4
R=3
4p3=4!/(4-3)!=24

k when do u use the other formula then?

 

[Streetwolf]

When order doesn't matter.

Order matters: Choose 3 people for 3 different prize amounts. First person picked gets the highest amount, 3rd person gets lowest.

Order does not matter: Choose 3 people for the same prize amount. It doesn't matter who gets picked first.