Khan/khan-exercises — Issue #9947: Counting 2 - 15conting
Author: KhanBugz
Created: 2011-12-31 17:43:41+00:00
State: open
Labels: chrome, wrong-or-unclear, xp

25+25-36x56-88-2/4=

[counting_2.html?seed=151&problem=handshakes](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/counting_2.html?seed=151&problem=handshakes&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/counting_2.html?seed=151&problem=handshakes&debug&activity=%5B%5D)

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Mozilla/5.0 (Windows NT 5.1) AppleWebKit/535.2 (KHTML, like Gecko) Chrome/15.0.874.121 Safari/535.2

MathJax is loaded, ready, queue length: 0