Probability of hitting a target given the chance to reroll the lowest die

DiceProbabilityProgram.cs

using System;

namespace Probability
{
    internal class Program
    {
        private struct RollAttempt
        {
            public int Result;
            public int[] Rolls;
        }

        private static Random _random;

        public static void Main(string[] args)
        {
            _random = new Random();

            int numberOfDice = AskUser("Number of dice:");
            int[] number = new int[(numberOfDice * 6) + 1];

            int target = AskUser("Target:");
            int retries = AskUser("Rerolls:");
            int iterations = 10000;

            int successful = 0;
            for (int i = 0; i < iterations; i++)
            {
                var roll = Roll(numberOfDice, target, retries);
                if (roll.Result >= target)
                {
                    successful++;
                }
                number[roll.Result]++;
            }
            Console.WriteLine($"===");
            var successRate = (double)successful / iterations;
            for (int index = 1; index < number.Length; index++)
            {
                var n = number[index];
                Console.WriteLine($"{index.ToString()}: {((double)n / iterations).ToString("P")}");
            }
            Console.WriteLine($"===\nTarget: {target}\nDice: {numberOfDice}\nRerolls: {retries}\nTarget Surpassed: {successRate.ToString("P")}");
            Console.WriteLine($"===\nPress Any Key...");

            Console.ReadLine();
        }

        private static RollAttempt Roll(int numberOfDice, int target, int retries)
        {
            int[] diceResults = new int[numberOfDice];
            int result = 0;

            for (int i = 0; i < diceResults.Length; i++)
            {
                result += diceResults[i] = _random.Next(1, 7);
            }

            int attempt = 0;
            while (result < target && attempt < retries)
            {
                int indexOfLowestDiceRoll = 0;
                result = diceResults[indexOfLowestDiceRoll];
                for (int i = 1; i < diceResults.Length; i++)
                {
                    result += diceResults[i];
                    if (diceResults[indexOfLowestDiceRoll] > diceResults[i])
                    {
                        indexOfLowestDiceRoll = i;
                    }
                }
                result -= diceResults[indexOfLowestDiceRoll];
                result += diceResults[indexOfLowestDiceRoll] = _random.Next(1, 7);
                attempt++;
            }
            return new RollAttempt { Result = result, Rolls = diceResults };
        }

        private static int AskUser(string displayText)
        {
            Console.WriteLine(displayText);
            int result = 0;
            while (!int.TryParse(Console.ReadLine(), out result))
            {
                Console.WriteLine("Couldn't parse number. Try without entering any special characters or letters.");
            }
            return result;
        }
    }
}