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A university has torn down anti-cheating posters from its exam hall after realising they had answers to a maths exam written on them. 一所大学撤掉了张贴在教学楼里禁止作弊的海报，因为他们发现海报上的公式正是一次数学考试的答案。 Officials at Plymouth University installed the signs ahead of the summer exams season – but failed to realise that a stock image of a hand covered in scribbles contained genuine formulae. 普利茅斯大学在夏日考试季前张贴了“禁止作弊”的海报，但当时没有发现那幅手上写满小抄的海报上恰好有考试需要用到的公式！ Students have since claimed that spotting the notes gave them a boost in a final-year maths exam – with one estimating that he will now score 10 per cent higher than he would have without the help. 一名学生称海报上的公式帮助他的期末数学考试成绩提高了10%。 The formulae cover areas including probability, trigonometry and probability. It includes a version of the complicated De Moivre’s theorem. 海报图中的公式涉及到了概率、几何，还包括复杂的棣莫弗定理。 Exam bosses claim the sign would have been too far away for students to read it from their desks – but some have claimed the extra knowledge boosted their result by an entire grade. 监考员称海报离考试座位远着呢，学生一般看不清，但有的监考员则称这些公式对整个年级的成绩提高都有帮助。 | 
