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If we observe series then each term of series follow the patterns like $+3,-2,+3,-2$ and so on.

  • $4+3=7$
  • $7-2=5$
  • $5+3=8$
  • $8-2=6$
  • $6+3=9$
  • $9-2=7$

Option $(A)$ is correct.

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