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If two ordered pairs (a, b) and (c, d) are equal, then:
Aa + b = c + d
Ba = d and b = c
Ca = c and b = d
Da × b = c × d
Answer & Solution
Correct answer: C. a = c and b = d
Equality of ordered pairs requires the FIRST elements equal AND the SECOND elements equal. So (a, b) = (c, d) iff a = c and b = d.
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