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77, 49, 36, 18, ?

  • A.9
  • B.16
  • C.4
  • D.8
  • E.3

Answer: D

Each number in the series is the product of the digits of the preceding number
Thus, \(7 \times 7 =49, 4\times9=36,..\)
\(\therefore\) The missing number \(= 1\times8=8\)

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