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 Question from susan: Out of 80 numbers how many combinations of 8 are there and what are they.

Hi Susan,

The number of combinations of $k$ things taken from $n$ things is called $n$ choose $k.$ You can find a definition and an example in a response to an earlier question. Google will do the arithmetic for you. If you type 80 choose 8 into the Google search window you get the response 28,987,537,150. Way too many to list.

Penny

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