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Assuming you mean
P(a,b) = a!/(a-b)!
C(a,b) = P(a,b)/b!
P(4,2) = 4!/(4-2)! = 4*3 = 12
P(8,7) = 8!/(8-7)! = 8*7*6*5*4*3*2 = 40,320
C(9,7) = 9!/(2!*7!) = 9*8/2 = 36
_____
You know, of course, that
0! = 1
1! = 1
n! = n*((n-1)!)
P(a,b) = a!/(a-b)!
C(a,b) = P(a,b)/b!
P(4,2) = 4!/(4-2)! = 4*3 = 12
P(8,7) = 8!/(8-7)! = 8*7*6*5*4*3*2 = 40,320
C(9,7) = 9!/(2!*7!) = 9*8/2 = 36
_____
You know, of course, that
0! = 1
1! = 1
n! = n*((n-1)!)
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