Checking the Math of '21' The No. 1 movie at the box office for the last two weekends has been 21, which depicts a group of Massachusetts Institute of Technology students who decide to try to relieve some tuition pressures by hitting the tables in Las Vegas. "Math guy" Keith Devlin talks about the movie.

Checking the Math of '21'

Checking the Math of '21'

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The No. 1 movie at the box office for the last two weekends has been 21, which depicts a group of Massachusetts Institute of Technology students who decide to try to relieve some tuition pressures by hitting the tables in Las Vegas. "Math guy" Keith Devlin talks about the card-counting system used in the movie.