Which innovative mathematical product was initially rejected by HP, later became one of the most revolutionary tools for mathematics education, and sold over 100 million units?

In the world of mathematics education and tools, product innovation has dramatically changed how we teach and learn complex concepts. Throughout history, certain products have revolutionized mathematical understanding and accessibility. This poll tests your knowledge about a significant mathematical product innovation that transformed how calculations are performed and visualized in educational settings worldwide.

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• The Texas Instruments TI-84 graphing calculator
• The abacus counting frame redesign by Soroban
• The HP-35 scientific calculator, the world's first handheld scientific calculator
• Mathematica software by Wolfram Research

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