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April 1, 2015

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Posted by **joanna** on Monday, February 23, 2009 at 7:05pm.

the answer is 9240, but i dont understand how to get that, help please??!

- math - gr 12 -
**Reiny**, Monday, February 23, 2009 at 8:07pmBreak it up into 3 cases

1. Joe at the door, then 10 others at the door, C(10,4) on the floor, C(6,6) as floaters

= 10x210x1 = 2100

2. Joe on the floor, leaving C(10,3) for the remainder on floor, C(8,2) for the door and C(6,6) as floaters

= 120x28x1 = 3360

3. Joe as floater leaving C(10,5) for the remaining floaters, C(6,4) for the floor, and C(2,2) for the door

= 252x15x1 = 3780

total = 2100+3360+3780 = 9240

- math - gr 12 -
**joanna**, Monday, February 23, 2009 at 8:38pmthanks!!!

- math - gr 12 -
**Geetha**, Monday, March 1, 2010 at 7:58pmTHANK YOU!

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