import sys

sys.setrecursionlimit(10 ** 9)
input = sys.stdin.buffer.readline

N = int(input())
T = [[] for _ in range(N)]
for _ in range(N - 1):
    u, v = (int(x) - 1 for x in input().split())
    T[u].append(v)
    T[v].append(u)

MOD = 998244353
modinv = lambda a, mod=MOD: pow(a, mod - 2, mod)

ans = - (N - 1) * N // 2


def dfs(v, parent):
    global ans
    subt = 1
    for x in T[v]:
        if x != parent:
            subt += dfs(x, v)
    ans += subt * (subt - 1) // 2 + (N - subt) * (N - subt - 1) // 2
    ans %= MOD
    return subt


dfs(0, -1)
ans *= modinv((N - 1) * N * (N - 1) // 2)
ans %= MOD
print(ans)