What is (first '((a b) (c d))) ?

  • A: a
  • B: (a b)
  • C: ((a b))
  • D: null
  • E: error

    Answer: B

    first returns the first thing in a list; a "thing" is a simple item, such as a symbol (string) or number, or a balanced pair of parentheses including everything inside, no matter how big.

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