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Given P = {a, b, c} and Q = {r}, the cartesian product Q × P is
A{(r, r, r)}
B{(a, r), (b, r), (c, r)}
C{(r, a), (r, b), (r, c)}
D{(a, b, c), r}
Answer & Solution
Correct answer: C. {(r, a), (r, b), (r, c)}
Q × P = {(q, p) : q ∈ Q, p ∈ P} = {(r, a), (r, b), (r, c)}. Order is critical.
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