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28, 33, 31, 36, ?, 39

  • A.32
  • B.34
  • C.38
  • D.40

Answer: B

Correct answer: 34

The series alternately adds 5 and subtracts 2: \( 28 + 5 = 33 \), \( 33 - 2 = 31 \), \( 31 + 5 = 36 \), so the next step subtracts 2: \[ 36 - 2 = \mathbf{34} \] and 34 + 5 = 39, as the series shows.

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