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I'm searching for an excellent answer on MSE about the intuition/interpretation of the binomial coefficient in combinatorics which arrived at the expression $\binom{n}{k} = \frac{n!}{(n-k)!k!}$ in two different ways. Unfortunately, I didn't upvote it at the time and my searches haven't lead me anywhere yet.

One of the forms presented was to interpret $\binom{n}{k} k!$ the same way as $\frac{n!}{n-k!}$ and compare both expressions. I'm trying to remember the other, because they looked great for teaching.

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The answer was found: https://math.stackexchange.com/a/119487/ using the approach described here: How to efficiently use Google to search Math.SE content?

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  • $\begingroup$ If I did not miss something, the linked answer only says that we can use Google with restricting to site:math.stackexchange.com. (And also provides a bookmarklet for this.) In case you (or your browser history) remember it; may I ask what was the search query you used to find this particular question. $\endgroup$ – Martin Sleziak Aug 15 '14 at 8:22
  • $\begingroup$ @MartinSleziak I tried several things, one of which worked; by now there's no way to recall which one. $\endgroup$ – user147263 Aug 15 '14 at 13:29

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