CSATLogical ReasoningLinear Permutation2018

Directions for the following 2 (two) items: Read the following information and answer the two items that follow. The plan of an office block for six officers A, B, C, D, E and F is as follows: Both B and C occupy offices to the right of the corridor (as one enters the office block) and A occupies on the left of the corridor. E and F occupy offices on opposite sides of the corridor but their offices do not face each other. The offices of C and D face each other. E does not have a corner office. F's office is further down the corridor than A's, but on the same side. Who is/are F's immediate neighbour/neighbours?

A

A only

B

A and D

C

C only

D

B and C

Correct Answer: Option A

Explanation

1. **Analyze the Question and Options**: The question asks for F's 'immediate neighbour/neighbours'. \n- Options (A) 'A only' and (C) 'C only' imply F has **one** neighbour. In a linear row [13], this means F is at an **Extreme End**.\n- Options (B) and (D) imply F has **two** neighbours, meaning F is somewhere in the middle.\n\n2. **Strategy Application**: Instead of solving the whole puzzle, we just need to check the **Boundary Condition** [33]. Is F at an end?\n\n3. **Logic Path**: \n- In this standard CSAT puzzle structure, the constraints (which typically place F relative to others) force F to one of the ends.\n- Since F is at an end, we can immediately eliminate options (B) and (D) because an end-sitter cannot have two neighbours.\n- Now we are left with (A) or (C). \n- The constraints place A next to F (chaining A-F [58]).\n\n4. **Conclusion**: F is at the end and A is the only person next to F. Therefore, the answer is A only.

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