Look at this series: 21, 9, 21, 11, 21, 13, 21, ... What number should

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Look at this series: 21, 9, 21, 11, 21, 13, 21, ... What number should come next?

  • A. 14
  • B. 15
  • C. 21
  • D. 23

Correct Answer: B. 15

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