const MOD: usize = 998244353;

fn power(base: usize, times: usize) -> usize {
    if times == 0 { return 1usize; }
    if times == 1 { return base; }
    let temp = power(base, times/2);
    temp * temp % MOD * power(base, times%2) % MOD
}

fn dfs(cur: usize, prev: usize, paths: &Vec<Vec<(usize, usize)>>, points: &mut Vec<usize>) -> usize {
    let mut ret = 1usize;
    for &(v, idx) in paths[cur].iter() {
        if v == prev { continue; }
        let val = dfs(v, cur, paths, points);
        ret += val;
        points[idx] = val;
    }
    ret
}

fn main() {
    let mut n = String::new();
    std::io::stdin().read_line(&mut n).ok();
    let n: usize = n.trim().parse().unwrap();
    let mut paths = vec![vec![]; n];
    for i in 0..n-1 {
        let mut temp = String::new();
        std::io::stdin().read_line(&mut temp).ok();
        let temp: Vec<usize> = temp.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
        let u = temp[0]-1;
        let v = temp[1]-1;
        paths[u].push((v, i));
        paths[v].push((u, i));
    }

    let mut points = vec![0usize; n-1];
    dfs(0, 0, &paths, &mut points);
    let mut result = 0usize;
    let total = n * (n-1) / 2;
    let modval = power(total % MOD, MOD-2);
    let modval2 = power(n-1, MOD-2);
    for i in 0..n-1 {
        let left = points[i];
        let right = n - left;
        result += (left * (left-1) / 2 + right * (right-1) / 2) % MOD * modval % MOD * modval2 % MOD;
        result %= MOD;
    }
    println!("{}", result);
}