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If A = {a, b, c, d} and B = {c, d, e, f}, what is A ∩ B?

  • A.{a, b, c, d, e, f}
  • B.{a, b}
  • C.{c, d}
  • D.{e, f}

Answer: C

The intersection keeps only the elements common to both sets.

\[ A \cap B = \{c, d\} \]

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