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Fill in the missing number in the series.

$2$     $3$      $6$      $15$  ___  $157.5$       $630$
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$2\times 1.5=3$

$3\times 2=6$

$6\times 2.5=15$

$15\times 3=45$ is answer

$45\times 3.5=157.5$   means each time increase multplication factor by $0.5$
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