Question
28 Â Â Â Â Â Â Â Â 57 Â Â Â Â Â Â Â Â Â Â 172
          689          ?              20677 What should come in place of question mark (?) in the following number series?Solution
28 × 2 + 1 = 57 57 × 3 + 1 = 172 172 × 4 + 1 = 689 689 × 5 + 1 = 3446 3446 × 6 + 1 = 20677
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