AMC 10 Step by Step
2007 AMC 10AProblem 16P16-20~3 minPrint

Integers a,b,c,a, b, c, and dd , not necessarily distinct, are chosen independently and at random from 0 to 2007, inclusive. What is the probability that adbcad-bc is even?

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Problem © Mathematical Association of America (MAA), American Mathematics Competitions. Reproduced for non-commercial educational use. Solution and commentary are original to this site. Also appeared as 2007 12A #12.