Question
20Â Â Â 60Â Â Â Â 150Â Â Â Â 300Â Â Â 450Â
  ? What will come in place of the question mark (?) in the following series?Solution
20 x 3 = 60 60 x 2.5 = 150 150 x 2 = 300 300 x 1.5 = 450 450 x 1 = 450
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