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Casio Fx-991esplus(Th) Scientific Calculator
|Features||•Number of Functions : 417
•Multi-replay: Quick and easy recall of previously executed formulas for editing and re-execution.
• Fraction calculations
• Combination and Permutation
(STAT-data editor, Standard deviation, Regression analysis)
• 9 variable memories
• Plastic keys
• Comes with slide-on hard case
Solar & Battery: Solar powered when light is sufficient, battery powered when light is insufficient.