Question 1
Statements:
No reliable is a useful.
All efficient are useful.
Conclusions:
I. No useful is a reliable.
II. No efficient is a reliable.
III. Some useful are not reliable.
Immediate vs Mediate Inference:
Immediate Inference: Direct conversion from one statement
Mediate Inference: Deduction requiring multiple statements
Checking Each Conclusion:
✓ Conclusion I: "No useful is a reliable" - IMMEDIATE INFERENCE
Conversion of "No reliable is a useful" - FOLLOWS
✓ Conclusion II: "No efficient is a reliable" - MEDIATE INFERENCE
All C are B (A) + No B is A (E) = A + E = E - FOLLOWS
✓ Conclusion III: "Some useful are not reliable" - IMMEDIATE INFERENCE
From "No A is B", definitely some B are not A - FOLLOWS
Answer: All conclusions I, II and III follow
Immediate Inference: Direct conversion from one statement
Mediate Inference: Deduction requiring multiple statements
Checking Each Conclusion:
✓ Conclusion I: "No useful is a reliable" - IMMEDIATE INFERENCE
Conversion of "No reliable is a useful" - FOLLOWS
✓ Conclusion II: "No efficient is a reliable" - MEDIATE INFERENCE
All C are B (A) + No B is A (E) = A + E = E - FOLLOWS
✓ Conclusion III: "Some useful are not reliable" - IMMEDIATE INFERENCE
From "No A is B", definitely some B are not A - FOLLOWS
Answer: All conclusions I, II and III follow