Be in in mathematical exam, although the teacher is surveillant very severe, examination time very short, the student is essential cannot cogged. Two pieces of identical examination paper discover however when but change,coiling.

Do you think this kind of circumstance may happen?

Solution: People suffers thinking to decide the effect of situation, always think always examination paper has been done by the student, however oversight the person that can one problem did not make hand in a blank examination paper.

Two classmates made blank examine paper, their examination paper is so identical.

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