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Public Service Entrance Exam (PSEE) · Question

If the sequence is 3, 7, 15, 31, what is the next number?

Each number is double the previous number plus one (3*2+1=7, 7*2+1=15, 15*2+1=31). So, 31*2+1=63.

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Question: If the sequence is 3, 7, 15, 31, what is the next number?

Answer options: ✅ 63

  • 61
  • 47
  • 59

Correct answer: 63

Explanation: Each number is double the previous number plus one (32+1=7, 72+1=15, 152+1=31). So, 312+1=63.

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