What takes longer is the endeavor to see, to grasp conceptually, how it is that, after easily managing analytically, that is, purely arithmetically, one condition of the task, namely the finding of the said coefficient by the expansion of the function of the variable after the latter has received the form of a binomial by the addition of an increment how, after this part of the task, the other condition, namely the omission of the remaining terms of the series except the first, can also be correct.