Question 1
Statements:
Some vehicles are appliances.
All appliances are devices.
Conclusions:
I. All vehicles are devices.
II. Some vehicles are not devices.
Complementary Pair Analysis:
Conclusions I and II form a complementary pair:
- "All vehicles are devices" (A-type)
- "Some vehicles are not devices" (O-type)
These are opposite statements where at least one can be true.
Venn Diagram:
Step 1: "Some vehicles are appliances" → Partial overlap
Step 2: "All appliances are devices" → appliances inside devices
Step 3: The part of vehicles overlapping with appliances is definitely inside devices
Step 4: But we DON'T know about the rest of vehicles
Possible Cases:
Case 1: All of vehicles inside devices → Conclusion I true
Case 2: Some of vehicles outside devices → Conclusion II true
Either-Or Rule:
When conclusions form complementary pair "All" and "Some not", answer is "Either-Or".
Answer: Either conclusion I or II follows
Conclusions I and II form a complementary pair:
- "All vehicles are devices" (A-type)
- "Some vehicles are not devices" (O-type)
These are opposite statements where at least one can be true.
Venn Diagram:
Step 1: "Some vehicles are appliances" → Partial overlap
Step 2: "All appliances are devices" → appliances inside devices
Step 3: The part of vehicles overlapping with appliances is definitely inside devices
Step 4: But we DON'T know about the rest of vehicles
Possible Cases:
Case 1: All of vehicles inside devices → Conclusion I true
Case 2: Some of vehicles outside devices → Conclusion II true
Either-Or Rule:
When conclusions form complementary pair "All" and "Some not", answer is "Either-Or".
Answer: Either conclusion I or II follows