Pick the odd one out:
$3, 6, 9, 22.5, 67.5, 236.25, 945$

6

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9

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22.5

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67.5

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Solution

The correct option is A $6$
Pattern of the series is
$3 \times 1.5 = 4.5$ ,
$4.5 \times 2 = 9$ ,
$9 \times 2.5 = 22.5$ ,
$22.5 \times 3 = 67.5$ ,
$67.5 \times 3.5 = 236.25$ ...
Therefore, number $6$ should be replaced by $4.5$ .

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