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in Mathematics by (130k points)

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Solution:  By the definition of the cartesian product,
P × Q = {(a, r ), (b, r), (c, r)} and Q × P = {(r, a), (r, b ), (r, c)}
Since, by the definition of equality of ordered pairs, the pair (a, r) is not equal to the pair
(r, a), we conclude that P × Q ¹ Q × P.
However, the number of elements in each set will be the same.

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