Pearson says 3x7x26 is not 546 11 years ago
I disagree with her premise. Higher stakes tests presumably have their answer keys reviewed more closely. Multiplication problems in math textbooks appropriately don't have their answer keys reviewed with the same degree of scrutiny. In medical qualification exams, if enough people get an answer wrong, it may be reviewed for an incorrect answer key, or even thrown out for being confusing or ambiguous.