#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define REP(i,a,n) for(int i=(a); i<(int)(n); i++)
#define rep(i,n) REP(i,0,n)
#define FOR(it,c) for(__typeof((c).begin()) it=(c).begin(); it!=(c).end(); ++it)
#define ALLOF(c) (c).begin(), (c).end()
typedef long long ll;
typedef unsigned long long ull;
//using mint = modint1000000007;
using mint = modint998244353;

int N;
vector<int> G[100005];
vector<pair<ll,ll>> edges;

int dfs(int v, int p){
  int ret = 1;
  rep(i,G[v].size()){
    if(G[v][i] == p) continue;
    ll res = dfs(G[v][i], v);

    edges.emplace_back(res, N-res);

    ret += res;
  }
  
  return ret;
}
  
int main(){
  cin >> N;
  rep(i,N-1){
    int a, b;
    cin >> a >> b;
    a--;
    b--;
    G[a].push_back(b);
    G[b].push_back(a);
  }
  
  dfs(0,-1);

  mint ret1(0), ret2(1);
  ret2 *= N*(ll)(N-1)/2;
  ret2 *= (N-1);
  rep(i,edges.size()){
    ll x = edges[i].first;
    ll y = edges[i].second;
    
    ret1 += x*(x-1)/2 + y*(y-1)/2;
  }

  mint ret = ret1 / ret2;

  cout << ret.val() << endl;
  
  return 0;
}