using System; using System.Collections; using System.Collections.Generic; using System.Collections.Specialized; using System.Text; using System.Text.RegularExpressions; using System.Linq; using System.IO; class Program { static void Main(string[] args) { new Magatro().Solve(); } } public class Scanner { private StreamReader Sr; private string[] S; private int Index; private const char Separator = ' '; public Scanner(Stream source) { Index = 0; S = new string[0]; Sr = new StreamReader(source); } private string[] Line() { return Sr.ReadLine().Split(Separator); } public string Next() { string result; if (Index >= S.Length) { S = Line(); Index = 0; } result = S[Index]; Index++; return result; } public int NextInt() { return int.Parse(Next()); } public double NextDouble() { return double.Parse(Next()); } public long NextLong() { return long.Parse(Next()); } public decimal NextDecimal() { return decimal.Parse(Next()); } public string[] StringArray(int index = 0) { Next(); Index = S.Length; return S.Skip(index).ToArray(); } public int[] IntArray(int index = 0) { return StringArray(index).Select(int.Parse).ToArray(); } public long[] LongArray(int index = 0) { return StringArray(index).Select(long.Parse).ToArray(); } public bool EndOfStream { get { return Sr.EndOfStream; } } } public class Magatro { private Scanner Cin; private const long Mod = 1000000007; private int N; private int[] A; private void Scan() { Cin = new Scanner(Console.OpenStandardInput()); N = Cin.NextInt(); A = Cin.IntArray(); } public void Solve() { Scan(); long result = Conbination(N, 3); var map = new Dictionary(); int d; foreach (int i in A) { if (map.TryGetValue(i, out d)) { map[i]++; } else { map.Add(i, 1); } } foreach (var p in map) { if (p.Value >= 3) { result +=(Mod- Conbination(p.Value, 3)); } if (p.Value >= 2) { result +=(Mod- Conbination(p.Value, 2) * (N - p.Value)); } result %= Mod; } Console.WriteLine((result+Mod*1000)%Mod); } private long Conbination(long n, long m) { long bunsi = MyMath.Factorial(n, Mod); long bunbo = (MyMath.Factorial(m, Mod) * MyMath.Factorial(n - m, Mod)) % Mod; return (bunsi * MyMath.MyPower(bunbo, Mod - 2, Mod))%Mod; } } static class MyMath { static public long MyPower(long a, long b, long mod) { long result = 1; while (b > 0) { if (b % 2 == 1) { result *= a; result %= mod; } a *= a; a %= mod; b /= 2; } return result; } static public long Factorial(long l, long mod) { if (l == 0) return 1; return (Factorial(l - 1, mod) * l) % mod; } }