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I've been studying the Encycl. of Rec. Diving for the PADI DM tests. I have been given some examples of the physics questions. I also think I understand Haldane's work (compartments, half lifes, allowable N loading, etc.) but am curious as to what sort of mathematical questions may be asked, as the book gives no examples....Or are the questions just about whether you understand the ideas, as they all lead to simply why we have the tables, which I do backwards and forwards.