RRB NTPC Circular Seating Arrangement — Study Material & 6 Practice MCQs | ZestExam
ZestExam
RRB NTPC Circular Seating Arrangement
Study Material · Concept Notes · Shortcuts
This page covers RRB NTPC Circular Seating Arrangement with complete concept notes, 6 graded practice MCQs, key points and exam-specific tips. Free to study.
In circular seating, positions are relative to each other. There is no first or last position. The key is to fix one person's position first, then arrange others relative to that person
💡Key Rules
1) Always fix one person's position to eliminate rotational possibilities 2) Clockwise and anti-clockwise directions matter 3) 'Opposite' means diametrically across 4) Adjacent means immediate left or right 5) Use process of elimination systematically.
🔢
Formula Block
Memorise — at least one formula appears in every paper
Total circular arrangements of n people = (n-1)! This is because we fix one position to avoid counting rotations as different arrangements. For restrictions like couples sitting together, treat them as single units.
📊
Exam Patterns
What examiners ask — read before attempting PYQs
→Common question types include
immediate neighbors, opposite positions, counting positions between people, and conditional arrangements. Most questions give 6-8 people with 4-6 conditions
⚡Shortcut Trick 1 - The Fixed Position Method
Always start by placing one person at the 'top' of the circle. This eliminates confusion about rotational arrangements. Mark positions as 1,2,3... clockwise from this fixed person
⚡Shortcut Trick 2 - The Opposite Formula
In a circle of n people, if person A is at position x, then the person opposite to A is at position x + n/2 (if n is even). For odd numbers, no one sits exactly opposite
✏️Worked Example 1
Six friends A,B,C,D,E,F sit around a circular table. B sits two places to the right of A. C sits opposite to A. D sits immediately left of C.
Where does E sit
→Solution Step-by-Step
1
Fix A at position 1 (top)
2
B sits two places right of A, so B at position 3
3
C sits opposite A. In 6-person circle, opposite of position 1 is position 4. So C at position 4
4
D sits immediately left of C. Left of position 4 is position 3. But B is already there. This means left of C is position 5. Wait - let me recalculate. If we number 1,2,3,4,5,6 clockwise, then left of 4 is position 3. Since B occupies 3, there's a contradiction
🔑Let me recheck
immediate left of position 4 is position 5 (going anti-clockwise). So D at position 5.
Step 5: Remaining positions are 2 and 6. E and F occupy these
→Answer
E sits at either position 2 or 6
✏️Worked Example 2
Seven people sit in a circle. P sits third to the right of Q. R sits second to the left of P. How many people sit between Q and R when counted clockwise from Q
→Solution Step-by-Step
1
Fix Q at position 1
2
P sits third to right of Q, so P at position 4
3
R sits second to left of P
→Left of position 4 going anti-clockwise
position 3 is first left, position 2 is second left. So R at position 2
Step 4: Count from Q(position 1) to R(position 2) clockwise: only position 7 comes between them
Answer: 1 person sits between Q and R
⚡Shortcut Trick 3 - The Gap Counting Formula
To count people between positions A and B clockwise: if B > A, count = B - A - 1. If B < A, count = n - A + B - 1 (where n is total people)
→Most Common Trap
Students often confuse 'left' and 'right' directions
💡Remember
in clockwise numbering, right means higher numbers, left means lower numbers. Also, 'second to the right' means there's one person in between, not sitting in the second chair. Many students miss this and count wrong positions.
Test Circular Seating Arrangement under exam conditions
Four friends—Arun, Bhavna, Chitra, and Deepak—sit around a circular table. Arun sits immediately to the right of Bhavna. Chitra sits immediately to the left of Bhavna. Who sits immediately to the right of Deepak?
Practice 2easy
Four people—Priya, Qasim, Ravi, and Sana—sit around a circular table. Ravi sits immediately to the left of Priya. Sana sits immediately to the left of Ravi. What is the position of Qasim relative to Priya?
Practice 3easy
Four students—Kavya, Laxman, Meera, and Nikhil—sit around a circular table. Meera sits immediately to the right of Kavya. Laxman sits immediately to the right of Meera. Which statement is definitely false?
Practice 4easy
Six colleagues sit around a circular table for a meeting: Aman, Bina, Chetan, Divya, Esha, and Farhan. Chetan sits immediately to the right of Aman. Divya sits immediately to the right of Chetan. Esha sits immediately to the right of Divya. If Bina sits immediately to the left of Aman, who sits immediately to the left of Farhan?
Practice 5medium
Eight people—M, N, O, P, Q, R, S, T—sit around a circular table facing inward. N sits third to the right of M. O sits immediately to the left of N. P sits second to the right of O. Q sits immediately to the right of P. R sits immediately to the left of M. S and T occupy the remaining seats. If S sits immediately to the right of Q, where does T sit relative to M?
Practice 6medium
Six friends—Arun, Bhavna, Chetan, Deepa, Esha, and Farhan—sit around a circular table. Bhavna sits immediately to the right of Arun. Chetan sits third to the right of Bhavna. Deepa sits immediately to the left of Arun. Who sits immediately to the right of Esha?
60-Second Revision — Circular Seating Arrangement
Remember: Fix one person first, then arrange others relative to that position
Formula: Opposite position = current position + n/2 (for even n only)
Trap: 'Second to right' means one person between, not second position
Trick: Number positions 1,2,3... clockwise for systematic solving
Direction: Right = clockwise = higher numbers, Left = anti-clockwise = lower numbers
Gap formula: People between A and B = |B-A|-1 positions
Quick check: Total positioned people should equal given number