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# Kirkman's schoolgirl problem - deriving the conditions on n - will rep! :) Watch

1. Right, I'm a little bit iffy on the whole conditions on n and I want to know where exactly we got from.

From what I understand, we multiply (number of days) with (which, from my understanding, is the number of triplets of girls - let's call it k) and which is the number of arrangements of pairs within each triplet, right? So then we have:

... which represents what, exactly?

Then all I know is that we equate this to , which is the same as , so finally we get

So, what I want to know is:

• Is the reason we're dividing n by 3 because we need triplets?
• Am I right about what represents?
• What exactly are we calculating when we do ?

Thanks for anyone who can clear this up for me, and rep readily available.
2. Bump... anyone?

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