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September 20, 2014

September 20, 2014

Posted by **David** on Saturday, April 16, 2011 at 2:33pm.

The book says it is 1260. I have no idea how they got this. I know it requires combinations. Could someone please explain it to me. Thanks a lot.

- Math -
**bobpursley**, Saturday, April 16, 2011 at 2:48pmconsider the rooms first.

Room 1: 9*8*7*6 ways for guests to be there

Room 2: 5*4*3 ways to be there

room 1: 2 ways to be there.

Now consider the beds: 4!3!2!=ways to arrange the beds in rooms.

(multipy the first three, divide by the ways beds can be arraged.

9!/(4!3!2!)=1260

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