The Nerds ALWAYS win!

Team: 
Scheimsonkac
Topic: Probability, Counting & Combinatorics
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The nerds are getting chased by bullies in the hallway with 7 doors. They need to figure out how many ways you can go in one door and out a different door.

Common Core Standards: 7.SP.8
Problem #: 
140 (2011-2012)
Problem Difficulty Level: 3 [?]