Question
4Â Â Â Â 9Â Â Â Â 28Â Â Â Â 99Â Â Â Â ?Â
  2105   12660 Find the missing number in the following number series:Solution
4 × 1 + 5 = 9 9 × 2 + 10 = 28 28 × 3 + 15 = 99 99 × 4 + 20 = 416  416 × 5 + 25 = 2105  2105 × 6 + 30 = 12660
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