Which Texas Instruments graphing calculator model, first released in 1990, became so ubiquitous in mathematics education that it has sold over 100 million units and remains largely unchanged in design today?

Texas Instruments has been a dominant force in the mathematics education market for decades. Their graphing calculators have become staples in classrooms around the world, influencing how mathematics is taught and learned. This trivia question explores the brand history of one of the most influential educational technology products of the late 20th century and its continued impact today.

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TI-83
TI-84
TI-89
TI-82