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21, 25, 33, 49, 81, ?

  • A.144
  • B.145
  • C.129
  • D.113
  • E.97

Answer: B

The pattern is \(+2^2, +2^3, +2^4, +2^5,...\)

\(\therefore\) Missing number = \(81+2^6 = 81+64=145.\)

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