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Friend I am very very sorry I don't know this answer
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A relation from A to B will include elements from A×B are {(1,4), (1,5), (1,6),(2,4),(2,5),(2,6),(3,4),(3,5),(3,6)
Step-by-step explanation:
now the relation R1 consists of elements form both A × B and B×A
thus R1 is not a relation from A to B
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