Question: Consider the following relationship R among the entity sets E 1 , E 2 , and E 3 . Suppose instances of E 1 has

Consider the following relationship R among the entity sets E1, E2, and E3. Suppose instances of E1 has 20 tuples and E3 has 30 tuples. In this case, if a valid instance of R has 120 tuples, what is the LEAST number of tuples in E2? Give your answer as an integer, like: 353.
Answer:
Consider the following relationship R among the entity sets E1, E2,

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