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Consider a database used to record the marks that students get in different
exams of different course offerings (sections).

a. Construct an E-R diagram that models exams as entities, and uses a
ternary relationship, for the database.

b. Construct an alternative E-R diagram that uses only a binary relationship
between students and sections. Make sure that only one relationship
exists between a particular student and section pair, yet you can represent
the marks that a student gets in different exams.
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