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I will start of with saying I´m not very good at English when considering mathematical

terms, neither an expert in Math.

My question goes as this:

I have a set of 1000 questions - which will be given in rounds with a set of 10.

So every round, you get 10 questions out of the 1000.

We want to change out 5 questions in every round.

So we want to have not only to have the total number of combinations

where 1 question is unique - but where a set of 5 is.

Please, if the formulation is a bit misleading - i will try to clarify in a reply.

As i said, this is even hard for me to question in the right way!

- Thanks in advance

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# Unique combinations in a set.(+)

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