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1 Answer

1 1 vote

The series is $-1,+2,-1,+2,\dots$

  • $22-1 =21$
  • $21+2=23$
  • $23-1=22$
  • $22+2=24$
  • $24-1=23$
  • $23+2=25$

Correct option is $C.$

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