Wednesday

July 23, 2014

July 23, 2014

Posted by **amy** on Wednesday, December 5, 2012 at 4:22pm.

- math -
**Anonymous**, Wednesday, December 5, 2012 at 5:36pmFor permutations without repetitions, the formula is n!/((n-r)!), where n is the number of things to choose from, and you choose r of them There is no repetition, and order matters.

Think about it this way. You have 28 candidates total. For the position of chairman, there are 28 possible people. After you select one person for chairmen, there are 27 people left - 27 possible people.

With each position that is filled, you have one less person for the job. At the end, you'll have all 8 positions filled, and 20 people left over.

So then we have 28!/((28-8)!) = 28x27x26x25x24x23x22x21. That should give you your answer.

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