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I got hooked on RPN while in engineering school and I've used them ever since, although in recent years it has been a challenge to find some of the more desireable HP models on the used market. I have a low priced TI scientific setting on my desk for quickie calculations. (If I leave my HP setting on my desk it will walk off.)
The TI models run from $10 to $100, and some of the more expensive ones are not allowed in some college classes because you can store equations and so forth in them, so probably you should ask your instructurs for what is allowed or not allowed.
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