Question

what's the equation for nCr and nPr? is there even a difference?

Answer 1

n P r = (n!)/(n-r)!

n C r = (n!)/(r!(n-r)!)

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There is a difference because you can connect the two to say

n C r = ( n P r )/( r! )

or

n P r = ( r! ) * ( n C r )

Answer 2

hmm okay thank you!