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Sequence: 4,9,19,39?

Question: Sequence: 4,9,19,39?
  • A. 59
  • B. 79 ✓
  • C. 61
  • D. 81
Correct Answer: B. 79
Explanation: Pattern: Multiply by 2 and add 1: 4×2+1=9, 9×2+1=19, 19×2+1=39, 39×2+1=79.

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