mod = 998244353

def non_rec_dfs(s):
    stack = []
    stack.append(~s)
    stack.append(s)
    par = [-1] * N
    sz = [1] * N
    ans = 0
    while stack:
        u = stack.pop()
        if u >= 0:
            stack.append(~u)
            for v in G[u]:
                if v == par[u]:
                    continue
                par[v] = u
                stack.append(v)
        else:
            u = ~u
            if par[u] != -1:
                sz[par[u]] += sz[u]
                ans += sz[u] * (sz[u] - 1)//2
                ans += (N - sz[u]) * (N - sz[u] - 1)//2
                ans %= mod

    return ans

N = int(input())
G = [[] for i in range(N)]
for i in range(N - 1):
    A, B = map(int, input().split())
    A, B = A - 1, B - 1
    G[A].append(B)
    G[B].append(A)

ans = non_rec_dfs(0)
all = N * (N - 1)//2 * (N - 1)
ans *= pow(all, mod - 2, mod) 
ans %= mod
print(ans)