A sample with excess Ar40 and atmosphere Are given an apparent age that is younger or older than the real age? why?

A sample with excess Ar40 and atmosphere Are given an apparent age that is younger or older than the real age? why?
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Homework questions are not really allowed here, on this site. Maybe someone will chime in, to say how you can go about finding the answer, but that’s about it. No straight answers.
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