Symbolic Logic

by Lewis Carroll

6.
1. All a are b′;
2. No b′ are c;
3. All d are a.

7.
1. No d are b′;
2. All b are a;
3. No c are d′.

8.
1. No b′ are d;
2. No a′ are b;
3. All c are d.

[pg111] 9.
1. All b′ are a;
2. No a are d;
3. All b are c.

10.
1. No c are d;
2. All b are c;
3. No a are d′.

11.
1. No b are c;
2. All d are a;
3. All c′ are a′.

12.
1. No c are b′;
2. All c′ are d′;
3. All b are a.

13.
1. All d are e;
2. All c are a;
3. No b are d′;
4. All e are a′.

14.
1. All e are b;
2. All a are e;
3. All d are b′;
4. All a′ are c;

15.
1. No b′ are d;
2. All e are c;
3. All b are a;
4. All d′ are c′.