1. 10 2. 9 3. 7 4. 8 1. 10 2. 9 3. 7 4. 8 1. 10 2. 9 3. 7 4. 8 1. 10 2. 9 3. 7 4. 8 1. 10 2. 9 3. 7 4. 8 1. 10 2. 9 3. 7 4. 8 1. 10 2. 9 3. 7 4. 8
Ans: 9 It is in the form of *2+1, *2-1, *2+1,,,,,, Then 5*2-1=9