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1, 9, 25, 49, ?, 121

  • A.64
  • B.81
  • C.91
  • D.100

Answer: B

Correct answer: 81

The terms are the squares of the odd numbers: \( 1^2, 3^2, 5^2, 7^2, \_ , 11^2 \). The missing one is \( 9^2 = \mathbf{81} \).

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