Combinatronics formulae in swift #Combinatronics #Swift

Combinatronics.swift

func factorial(_ number: Int) -> Int {

var fact = 1

for n in 1..<number {

fact = fact + fact * n

}

return fact

}

func nCr(_ n: Int, _ r: Int) -> Int {

let nCr = factorial(n) / (r * factorial(n – r))

return nCr

}

func nPr(_ n: Int, _  r: Int) -> Int {

let nPr = factorial(n) / factorial( n – r )

return nPr

}