Permutation Coefficient | Returns value of Permutation Coefficient P ( n , k ) ; base case ; Calculate value factorials up to n ; P ( n , k ) = n ! / ( n - k ) ! ; Driver Code
< ? php function permutationCoeff ( $ n , $ k ) { $ fact = array ( ) ; $ fact [ 0 ] = 1 ; for ( $ i = 1 ; $ i <= $ n ; $ i ++ ) $ fact [ $ i ] = $ i * $ fact [ $ i - 1 ] ; return $ fact [ $ n ] / $ fact [ $ n - $ k ] ; } $ n = 10 ; $ k = 2 ; echo " Value ▁ of ▁ P ( " , $ n , " ▁ " , $ k , " ) ▁ is ▁ " , permutationCoeff ( $ n , $ k ) ; ? >