Question 1
Five persons V, W, Z, Y and X are to be seated in a row facing North.
The following conditions apply:
- If V sits at an extreme end, then Z must sit immediately next to W
- If V does not sit at an extreme end, then Y must sit at an extreme end
- X cannot sit next to V
- W sits second from the left
Which of the following must be FALSE?
Solution Approach:
Step 1: Apply the fixed condition
- W sits second from the left β W at position 2 (fixed)
Step 2: Enumerate all valid arrangements
Testing all 120 possible arrangements with W at pos 2, applying all conditions.
7 valid arrangement(s) found.
Valid arrangement(s):
β’ V W Z Y X
β’ V W Z X Y
β’ Z W X Y V
β’ Y W V Z X
β’ X W V Z Y
β’ X W Z V Y
(shown up to 6)
Step 3: Test each MCQ option
- "W sits at position 2": β Possible in at least one valid arrangement
- "X sits at position 4": β Possible in at least one valid arrangement
- "X sits at position 1": β Possible in at least one valid arrangement
- "V sits at position 2": β NEVER possible β must be FALSE
Step 4: Conclusion
"V sits at position 2" is impossible in ALL 7 valid arrangement(s) β it must be FALSE.
All other options occur in at least one valid arrangement.
Answer: "V sits at position 2" must be FALSE.
Step 1: Apply the fixed condition
- W sits second from the left β W at position 2 (fixed)
Step 2: Enumerate all valid arrangements
Testing all 120 possible arrangements with W at pos 2, applying all conditions.
7 valid arrangement(s) found.
Valid arrangement(s):
β’ V W Z Y X
β’ V W Z X Y
β’ Z W X Y V
β’ Y W V Z X
β’ X W V Z Y
β’ X W Z V Y
(shown up to 6)
Step 3: Test each MCQ option
- "W sits at position 2": β Possible in at least one valid arrangement
- "X sits at position 4": β Possible in at least one valid arrangement
- "X sits at position 1": β Possible in at least one valid arrangement
- "V sits at position 2": β NEVER possible β must be FALSE
Step 4: Conclusion
"V sits at position 2" is impossible in ALL 7 valid arrangement(s) β it must be FALSE.
All other options occur in at least one valid arrangement.
Answer: "V sits at position 2" must be FALSE.