It is the dreaded PASAT: Paced Auditory Serial Addition Test. A YouTube user put one together so you can try it out for yourself! Part 1 is a prep, 2 is the test, and 3 includes the answers (although you'll know when you screw up).
Parts 1-3
http://www.youtube.com/watch?v=F2-z3nGK02A&NR=1
http://www.youtube.com/watch?v=ZM6CkxCGpaU
http://www.youtube.com/watch?v=IDauv..._order&list=UL
Parts 1-3
http://www.youtube.com/watch?v=F2-z3nGK02A&NR=1
http://www.youtube.com/watch?v=ZM6CkxCGpaU
http://www.youtube.com/watch?v=IDauv..._order&list=UL
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