In the following number series,only one number is wrong. Find out that wrong number:
$2, 6, 30, 210, 2520, 20790$

  • A
    $30$
  • B
    $6$
  • C
    $210$
  • D
    $2520$

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$10, 14, 25, 55, 140, ?$

$5, 3, 4, ?, 38$

Find the missing number in the proportion: $6 : 5 :: 8 : ?$

Find out the odd number from the given sequence: $7, 12, 40, 222, 1742, 17390, 208608$.

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