using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NMi => ReadLine().Split().Select(c => int.Parse(c) - 1).ToArray();
    static int[][] NMap(int n) => Enumerable.Repeat(0, n).Select(_ => NMi).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var n = NN;
        var map = NMap(n - 1);
        var tree = new List<int>[n];
        for (var i = 0; i < n; ++i) tree[i] = new List<int>();
        foreach (var edge in map)
        {
            tree[edge[0]].Add(edge[1]);
            tree[edge[1]].Add(edge[0]);
        }
        var ans = 0L;
        DFS(n, 0, -1, tree, ref ans);
        var mod = 998_244_353;
        ans %= mod;
        var all = (long)n * (n - 1) / 2 % mod * (n - 1) % mod;
        WriteLine((all - ans + mod) % mod * Exp(all, mod - 2, mod) % mod);
    }
    static int DFS(int n, int cur, int prev, List<int>[] tree, ref long ans)
    {
        var count = 1;
        foreach (var next in tree[cur])
        {
            if (prev == next) continue;
            var num = DFS(n, next, cur, tree, ref ans);
            ans += (long)num * (n - num);
            count += num;
        }
        return count;
    }
    static long Exp(long n, long p, int mod)
    {
        long _n = n % mod;
        var _p = p;
        var result = 1L;
        if ((_p & 1) == 1) result *= _n;
        while (_p > 0)
        {
            _n = _n * _n % mod;
            _p >>= 1;
            if ((_p & 1) == 1) result = result * _n % mod;
        }
        return result;
    }
}