Which calculator company had to recall 4 million devices in 2019 due to a computational error that affected advanced calculus operations?

Product recalls can be costly affairs, but when mathematical errors are involved, the consequences can be particularly severe. The educational materials industry has seen several notable recalls due to computational errors, incorrect formulas, or flawed mathematical concepts. These mistakes not only impact learning outcomes but can damage brand reputation and lead to significant financial losses. Test your knowledge about one of the most expensive math-related product recalls in history!

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Texas Instruments, when their TI-Nspire CX II models incorrectly computed certain limits in calculus problems
Casio, when their fx-991EX models produced systematic errors in matrix calculations affecting engineering applications
HP, when their Prime G2 calculators gave incorrect results for certain differential equations used in physics applications
Sharp, when their EL-W516X scientific calculators showed statistical calculation errors affecting standard deviation values