# ordered pair Quiz

EN- Choose the most appropriate answer for each question.
- Question 1 :
- ordered pairs
- ordered pair

If an ____________ were defined (in terms of sets) as then the "first element" of an ____________ S could be defined as CAR(S) where CAR(S) = x if and only if . Likewise, the "second element" of S could be defined as CDR(S) where CDR(S) = x if and only if . If the two elements happened to be equal, then the ____________ would still have cardinality two as would be naturally expected.

Source: Wiktionary

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