Find out the missing number in the following sequence:
$1, 3, 3, 6, 7, 9, ?, 12, 21$

  • A
    $10$
  • B
    $11$
  • C
    $12$
  • D
    $13$

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Find out the wrong term from the given series:
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$3, 8, 15, 24, 34, 48, 63$

Find the missing term for the given series from the given alternatives:
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Which number would replace the question mark in the series $7, 12, 19, ?, 39$.

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