hey this d=sol is given by edurev study material however I also don't understand the solutionThe given expression can be broken as: 18n2/n + 9n/n + 8/n. This gives us: 18n + 9 + 8/n.Now we can see that whatever the value of ‘n’, 18n + 9 will always give an integral value. Therefore, it now depends upon 8/n only ⇒ n can have any integral value, which is a factor of 8.The integers, which will satisfy this condition are �1, �2, �8, �4. Thus, in total, n can take 8 values.