![]() So, following several pieces of advice found commonly in other forums, we try the following, without success: Of course, depending on $n$ we have vastly different results. Let's take a minimal simple example: expanding the binomial coefficient $2n \choose n$. Note that I have already read the related MSO question " Tell Wolfram Alpha that a variable is a natural number", but that did not help. Ever since I began using Wolfram Alpha for quick online calculations I have had trouble specifying the domain of my variables.
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