732983 was the one I noticed, since it was bumped by a new answer today.
The oldest one 66118 already has several duplicates linked to it.
66118 asks: "How can I compute it, without using calculus?"
The other ones (based on the title) seem to be asking about solution based on binomial theorem.
Can we still close them as duplicates? Can perhaps some of them be merged?
My suggestion would be to remove the sentence "How can I compute it, without using calculus?" from the oldest one. Or at least change it to something weaker, like "Solutions without calculus are preferred, but any solution is welcome."
For me the oldest one (66118) seems like a reasonable choice for the duplicate target because it already has several posts linked to it (some only linked, some closed as duplicates), so it has bigger chance to be listed among frequent questions.
BTW I should also say that the OP of 66118 would probably not mind changing the wording of the question a bit. They were not seen on the site since 2012.
And also after this change, perhaps the answer with integral could be undeleted.
