In this question, there are 3 conditions that need to be met 1. The number is 3-digit 2. Hundreds digit >7 (number that will fulfill it would be 8 or 9) 3. The tens is 1 more than hundred( since the hundred possibilities is 8 or 9, then 9 in hundreds can't be used since no number higher than 9) 4. The one digit <2( that mean 0, 1)
Using the list above, you can make your possible number: 890 891