Question: Suppose R is an n-ary relationship between the entity sets E1, E2, E3, which has sharp arrows only at E1 and E2. If E1 has

Suppose R is an n-ary relationship between the entity sets E1, E2, E3, which has sharp arrows only at E1 and E2. If E1 has 3 tuples, E2 has 4 tuples, and E3 has 5 tuples, then the the maximum number of tuples R can have would be?

why is 20 the answer???

Thank you

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