text: Number of loops of size k starting from a specific node | Return the Number of ways from a node to make a loop of size K in undirected complete connected graph of N nodes ; Driver Code
code: < ? php function numOfways ( $ n , $ k ) { $ p = 1 ; if ( $ k % 2 ) $ p = -1 ; return ( pow ( $ n - 1 , $ k ) + $ p * ( $ n - 1 ) ) / $ n ; } $ n = 4 ; $ k = 2 ; echo numOfways ( $ n , $ k ) ; ? >