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Question

5 Boys P, Q, R, S, and T are sitting around a pentagonal table and their faces are towards each other, P is between Q and R. S is to the left of T. Q is to the left of S. Who is to the right of P?

The correct answer is

(b) Q

Understanding the Pentagonal Seating Arrangement Puzzle

This question asks us to figure out the sitting arrangement of five boys, P, Q, R, S, and T, around a pentagonal table. They are all facing towards the center of the table. We are given several clues about their relative positions, and we need to use these clues to determine who is sitting to the right of P.

Analyzing the Seating Clues

Let's break down the information given in the clues:

  • Clue 1: P is between Q and R. This means the sequence around P is either Q-P-R or R-P-Q.
  • Clue 2: S is to the left of T.
  • Clue 3: Q is to the left of S.

In a circular arrangement where people are facing the center, "to the left of" means the person is in the next position when moving in a specific direction around the table (typically clockwise if 'left' is considered relative to one's own left hand when facing inwards). Let's assume 'left' corresponds to a clockwise movement around the table for consistency in linking the clues.

Building the Arrangement Step-by-Step

We can combine the clues to build the arrangement:

  1. Start with Clues 2 and 3: We know Q is to the left of S, and S is to the left of T. Following our assumption that 'left' means the next person in a clockwise direction, this gives us a partial sequence: T → S → Q (where → indicates 'to the left of'). So, in a clockwise direction, we have T, then S, then Q.
  2. Now, consider Clue 1: P is between Q and R. We have the sequence ..., Q, ... We need to fit P and R such that P is between Q and R. Given the partial sequence T, S, Q, if P is between Q and R, the arrangement must continue from Q. The only way for P to be between Q and R immediately following Q in a clockwise direction is Q, P, R.
  3. Combining the sequences: We have T → S → Q and Q → P → R. Putting this together, the full clockwise sequence of the five boys around the table is T, S, Q, P, R.

Verifying the Seating Arrangement

Let's check if this clockwise arrangement T → S → Q → P → R satisfies all the conditions:

  • P is between Q and R: Yes, in the sequence Q-P-R.
  • S is to the left of T: Yes, T → S in the clockwise sequence.
  • Q is to the left of S: Yes, S → Q in the clockwise sequence.

All conditions are met. The clockwise arrangement around the pentagonal table is T, S, Q, P, R.

Determining Who is to the Right of P

Now we need to find who is to the right of P. If the clockwise direction is 'left', then the counter-clockwise direction is 'right'.

  • The clockwise sequence is: T → S → Q → P → R → T (wrapping around the table).
  • Starting from P, moving in the counter-clockwise direction (which is 'right' from P's perspective), we look at the person before P in the clockwise sequence.
  • In the clockwise sequence T, S, Q, P, R, the person immediately before P is Q.

Therefore, Q is to the right of P.

Let's visualize the seating arrangement (clockwise):

Position 1 Position 2 Position 3 Position 4 Position 5
T S Q P R

From P's position, moving clockwise is left (to R), and moving counter-clockwise is right (to Q).

Conclusion

Based on the logical deduction from the given clues, the person to the right of P is Q.

Revision Table for Seating Arrangements

Concept Explanation Key Point
Circular Arrangement People sitting around a circular or polygonal table. Positions are relative.
Facing Centre People are looking towards the middle of the table. Left and right are determined from the person's perspective facing inwards.
"Left of" The person in the next seat following a specific direction (usually clockwise, but check consistency). Can be used to build a sequence.
"Right of" The person in the next seat following the opposite direction (usually counter-clockwise). Opposite of "left of".
"Between" A person has specified individuals on their immediate left and right. Fixes a local sequence of three people.

Understanding the directions (left/right) in a circular arrangement is key to solving these types of seating arrangement puzzles.

Additional Information on Logical Reasoning Puzzles

Seating arrangement puzzles are a common type of question in logical reasoning sections of competitive exams. They test your ability to follow instructions, combine multiple pieces of information, and deduce a final configuration. Here are some tips for solving such puzzles:

  • Read all clues carefully before starting.
  • Draw a diagram (a circle or polygon) to represent the table and positions.
  • Start with the most concrete clues, such as "X is sitting between Y and Z" or "X is sitting opposite Y".
  • Use the 'left of' and 'right of' clues to build sequences. Be consistent with your assumption of which direction is 'left' (e.g., always clockwise).
  • Combine partial arrangements you deduce from different clues.
  • If a clue has two possibilities (like P is between Q and R could be Q-P-R or R-P-Q), note them down and see which one fits with other clues. Sometimes you might need to test out one possibility.
  • Verify your final arrangement against all the given clues to ensure accuracy.
  • Pay close attention to what the question asks for (e.g., "who is to the right of P?", "who is opposite S?").

Practice with different types of seating arrangements (linear, circular, square/rectangular) and varying numbers of people to improve your skills.

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