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**Brian Snellgrove****Guest**

We have a room of 25 people each of whom has 10 unique items of knowledge about an agreed subject.

How many unique conversations are needed to discuss each of the 250 items if we define a discussion `unit` as either 2, 3, or 4 people.

so the conversation between 1 and 2 would be different from 1, 2 and 3, different again from 1,2,3, and 4

Thank you folks. I need this for a lecture.

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