#include<bits/stdc++.h>
using namespace std;
typedef long long int ll;


int main()
{
  freopen("input.txt","r",stdin);
  freopen("output.txt","w",stdout);
  int n,i,j,k,a,t,cas;
  cin>>t;
  for(cas=1;cas<=t;cas++)
  {
  cin>>n;
  int arr[n+5],cnt=0,sum=0;
  for(i=0;i<n;i++)
  {
    cin>>a;
    if(a<0){
      a*=-1;
      cnt++;
    }
    sum+=a;
  }
  cout<<"Case "<<cas<<": ";
  if(cnt==n)
  {
    cout<<"inf"<<endl;
    continue;
  }
  int total,bad=cnt,N;

  N=n-bad;
  int gcd=__gcd(sum,N);
  cout<<sum/gcd<<"/"<<N/gcd<<endl;

 }
 return 0;
}