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11, 10, ?, 100, 1001, 1000, 10001

  • A.101
  • B.110
  • C.111
  • D.None of these

Answer: A

Correct answer: 101

The terms come in pairs, each pair one digit longer than the last: 11 and 10, then 101 and 100, then 1001 and 1000, then 10001. The missing term is the first of the second pair.

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