static double resultOfAllSubsets ( int arr [ ] , int N ) {
  double result = 0.0 ;
  int sum = 0 ;
  for ( int i = 0 ;
  i < N ;
  i ++ ) sum += arr [ i ] ;
  for ( int n = 1 ;
  n <= N ;
  n ++ ) result += ( double ) ( sum * ( nCr ( N - 1 , n - 1 ) ) ) / n ;
  return result ;
}

static double resultOfAllSubsets ( int arr [ ] , int N ) { double result = 0.0 ; int sum = 0 ; for ( int i = 0 ; i < N ; i ++ ) sum += arr [ i ] ; for ( int n = 1 ; n <= N ; n ++ ) result += ( double ) ( sum * ( nCr ( N - 1 , n - 1 ) ) ) / n ; return result ; }
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