public void TestMethod2()
        {
            //Arrange
            int  n        = 13;
            long expected = 23514624000;

            //Act
            var res = LargestProductInSeries.Solve(n);

            //Assert
            Assert.AreEqual(expected, res);
        }
        public void TestMethod1()
        {
            //Arrange
            int n        = 4;
            int expected = 5832;

            //Act
            var res = LargestProductInSeries.Solve(n);

            //Assert
            Assert.AreEqual(expected, res);
        }