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The Pay Phone Problem Introduction This coursework is about finding all the possible combinations for putting in to payphones various different coins and using those results to try to find a Formula that works so you would successfully be able to predict how many coins you would have to put in the payphone for the next total without having to go through all the listings. I have tried to set all the possible listings into an easy to read and an easy to follow pattern so that if I have made any mistakes they are easy to see. There are three parts to this coursework, the first 2 parts are an investigation into specific coins used and after the first 2 investigations there is a formula that works for those coins. The third investigation is a more general case, showing shortcuts and also the relevance of prime numbers to the formula's from the first 2 cases. Investigation 1 This investigation is...

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