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The number of constant mappings from A equals left curly bracket 1 comma 2 comma 3 comma 4 horizontal ellipsis horizontal ellipsis comma n right curly bracket to B equals left curly bracket a comma b right curly bracket is

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  1. text  n!  end text
  2. n
  3. 2
  4. 2 to the power of n

    Answer:The correct answer is: 2

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