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Original Message (ID '180894') By Student0002012:
Thank you very much for your help "jf"! Everything you told me worked perfectly and the literature helped me alot. But it still doesn't work properly: Mathematica just uses 1 solution and then counts all nonnegative solution! And if i try to change (Do[pension=...) "=" to --> ":=", i get an error message. It would be very kind, if somebody could find the mistake why mathematica loops just 1 solution.