public void CountingOfVariants_4_out9()
        {
            // Arrange
            int expected = 4;

            // Act
            var actual = new NumberOfVariants().CountingOfVariants(4);

            // Assert
            Assert.AreEqual(expected, actual);
        }
        public void CountingOfVariants_1_out2()
        {
            // Arrange
            int expected = 2;

            // Act
            var actual = new NumberOfVariants().CountingOfVariants(1);

            // Assert
            Assert.AreNotEqual(expected, actual);
        }
        public void CountingOfVariants_16_out36()
        {
            // Arrange
            int expected = 36;

            // Act
            var actual = new NumberOfVariants().CountingOfVariants(16);

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