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What is the composite relation R◦R?B

Questions:A) Let R be a binary relation on the set of integers such that (a,b) ∈ R if and only if b = 2a. What is the composite relation R◦R?B)Let R be a binary relation on the set of ordered pairs of integers such that ((a,b),(c,d)) ∈ R if and only if ad = bc. Show...