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What do you need it for? Many tests allow only scientific calculators, not graphing ones. However, if you're planning to take calculus or statistics, you definitely need a graphing calculator. I'd say the TI-83 and TI-84 are both good because they're the most common. You definitely don't want a calculator that nobody else has, or else you'll spent all of class trying to figure it out like I did last year.
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