Which mathematics education product was famously recalled in 2010 after shipping with critical formula errors that cost its publisher over $3 million in losses?

Even in the world of mathematics education, product development can go terribly wrong. Throughout history, various companies have attempted to revolutionize how we learn and apply mathematical concepts through innovative products. However, not all of these ventures succeeded. This poll tests your knowledge about a famous product failure in the mathematics education industry that cost its company millions.

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Pearson's 'Advanced Calculus Solutions Manual' with 600+ incorrect answers
Texas Instruments' TI-84 Plus CE with faulty integration algorithms
McGraw-Hill's 'Statistical Analysis Software' that produced inverted probability distributions
Wolfram Alpha's initial mobile app release with incorrect symbolic manipulation