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A comment on Why 37signals Doesn't Hire Programmers Based on Brainteasers. Parent comment
For an algorithms heavy job, I would hope a candidate would be able to derive this equation with a little guidance (ie, reminding them about n choose k and how to write that with factorials)
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For an algorithms heavy job, I would hope a candidate would be able to derive this equation with a little guidance (ie, reminding them about n choose k and how to write that with factorials)