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January 29, 2015

January 29, 2015

Posted by **Jason** on Thursday, October 27, 2011 at 6:08pm.

- Discrete Math -
**MathMate**, Thursday, October 27, 2011 at 9:15pmTake out Ed and Gail (7 people left). Choose 5 at a time to take pictures without the couple. There are

N1=7!/(7-2)! possible pictures.

Now treat the couple as a single person, and get 3 other people for pictures (N2).

Don't forget to ask Gail and Ed to change places (2*N2)

Add up the two to get the total=N1+2N2

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