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5, 20, 80, 320, … 1280

  • A.5120
  • B.5220
  • C.4860
  • D.3642

Answer: A

Correct answer: 5120

Each term is four times the one before: \( 5, 20, 80, 320, 1280 \), so the term after 1280 is \[ 1280 \times 4 = \mathbf{5120} \]

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