Question
8Â Â Â Â 13Â Â Â Â 36Â Â Â Â 123Â Â Â Â ?Â
  2585 What will come in place of the question mark (?) in the following series?Solution
8 × 1 + 5 = 13 13 × 2 + 10 = 36 36 × 3 + 15 = 123 123 × 4 + 20 = 512  512 × 5 + 25 = 2585
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