📑 Topics on this page (Jump to Topic):
📌 1. Linear Seating
- Facing north: their right = your right. Facing south: their right = your left.
- Distinguish 'immediate neighbour' from 'second to the right'.
- 'Right of X' = anywhere to the right; 'immediate right of X' = the very next seat.
📌 2. Circular Seating
- Facing the centre: right = anticlockwise, left = clockwise.
- Facing outward: right = clockwise.
- With n people, 'opposite' exists only for even n; it is n/2 seats away.
💡 Memory Tip: Start with the person who has the most clues, and draw each possible case separately.
📌 3. Floor / Box Puzzles
- Bottom floor = 1; 'above' means a higher number.
- Make a table: rows = floors, columns = person/attribute.
📌 4. Data Sufficiency
| Option | Meaning |
|---|---|
| A | I alone is sufficient |
| B | II alone is sufficient |
| C | Either I or II alone is sufficient |
| D | Both together are needed |
| E | Not sufficient even together |
⚠️ Exam Traps:
- In DS you need not compute the answer — only check whether one definite answer is possible.
📌 5. Practice MCQs
📝 Practice MCQs (prepared by SF Prep — not PYQs)
Q1. A, B, C, D, E sit in a row facing north. C is in the middle. A is to the immediate left of C. E is to the immediate left of A. D is to the immediate right of C. Who is at the right end? Practice
Correct answer: (B)
Order (left to right): E, A, C, D, B — B is at the right end.
Order (left to right): E, A, C, D, B — B is at the right end.
Q2. Six friends sit in a circle facing the centre. Q is opposite P. R is to the immediate right of P. S is to the immediate right of Q. Who is opposite R? Practice
Correct answer: (C)
Facing the centre, right = anticlockwise. R is P's anticlockwise neighbour and S is Q's; both are one step the same way from the P–Q line, so R and S are opposite.
Facing the centre, right = anticlockwise. R is P's anticlockwise neighbour and S is Q's; both are one step the same way from the P–Q line, so R and S are opposite.
Q3. A building has 5 floors (bottom = 1). A lives just above B. B is on floor 2. C is on the top. D is above A but below C. Which floor is E on? Practice
Correct answer: (D)
B=2, A=3, C=5, D=4 ⇒ E = 1.
B=2, A=3, C=5, D=4 ⇒ E = 1.
Q4. Question: What is X's age? I. X is 5 years older than Y. II. Y is 20 years old. Practice
Correct answer: (A)
Together X = 25; neither alone works.
Together X = 25; neither alone works.
Q5. P, Q, R, S sit in a row facing south. Q is to P's immediate right, R to Q's immediate right and S to R's immediate right. Who is second from the west end? Practice
Correct answer: (B)
For a person facing south, right = west. East to west: P, Q, R, S ⇒ west end is S, second from it is R.
For a person facing south, right = west. East to west: P, Q, R, S ⇒ west end is S, second from it is R.
Q6. A, B, C, D, E, F sit at a round table facing the centre. Only C sits between A and B. D is opposite A. Who can be opposite B? Practice
Correct answer: (C)
A(1), C(2), B(3), D(4) — opposite B(3) is seat 6, which may be E or F.
A(1), C(2), B(3), D(4) — opposite B(3) is seat 6, which may be E or F.
Q7. Question: What day is today? I. Yesterday was Sunday. II. The day after tomorrow will be Wednesday. Practice
Correct answer: (D)
I gives Monday; II also gives Monday (day after tomorrow Wednesday). Either alone is sufficient.
I gives Monday; II also gives Monday (day after tomorrow Wednesday). Either alone is sufficient.
Q8. Five girls sit in a row facing north. Seema is at the left end. Reena is second to the right of Seema. Meena is to Reena's immediate right. Rita is not at either end. Where is Geeta? Practice
Correct answer: (A)
Seema(1), Reena(3), Meena(4). Seats 2 and 5 remain; Rita not at an end ⇒ Rita 2, Geeta 5 (right end).
Seema(1), Reena(3), Meena(4). Seats 2 and 5 remain; Rita not at an end ⇒ Rita 2, Geeta 5 (right end).
Q9. Three boxes are stacked: red, blue, green. Blue is just above red. Green is not at the bottom. Which is on top? Practice
Correct answer: (B)
Green not at bottom ⇒ red bottom, blue middle, green top.
Green not at bottom ⇒ red bottom, blue middle, green top.
Q10. Question: Is M taller than N? I. M is taller than O. II. O is taller than N. Practice
Correct answer: (C)
M > O > N ⇒ yes; neither alone links M and N.
M > O > N ⇒ yes; neither alone links M and N.
Q11. Eight people sit in a circle facing the centre. B is third to the right of A. The person opposite B is how many places to the left of A? Practice
Correct answer: (D)
In 8 seats, opposite = 4 seats away. B is 3 right of A ⇒ opposite of B is 3 + 4 = 7 right of A = 1 left of A.
In 8 seats, opposite = 4 seats away. B is 3 right of A ⇒ opposite of B is 3 + 4 = 7 right of A = 1 left of A.
Q12. Question: How many boys are in the group? I. There are 30 students. II. Girls outnumber boys by 6. Practice
Correct answer: (A)
b + (b + 6) = 30 ⇒ b = 12; neither alone works.
b + (b + 6) = 30 ⇒ b = 12; neither alone works.
Q13. In a 6-floor building (bottom = 1), P, Q, R, S, T, U live on different floors. P is on floor 4. Q is just below P. R is on the top. S is below Q but not at the bottom. T is above P. Where is U? Practice
Correct answer: (B)
P=4, Q=3, R=6, T=5, S=2 ⇒ U=1.
P=4, Q=3, R=6, T=5, S=2 ⇒ U=1.
Q14. A, B, C, D sit around a square table facing the centre. C is opposite A. B is to A's immediate left. On which side of A is D? Practice
Correct answer: (C)
Of four seats, A's left is B, opposite is C ⇒ the remaining seat, A's right, is D.
Of four seats, A's left is B, opposite is C ⇒ the remaining seat, A's right, is D.
Q15. Question: Is x even? I. x is divisible by 4. II. x is divisible by 3. Practice
Correct answer: (D)
Every multiple of 4 is even ⇒ I suffices; multiples of 3 can be even or odd (6, 9).
Every multiple of 4 is even ⇒ I suffices; multiples of 3 can be even or odd (6, 9).
Q16. Five boxes V, W, X, Y, Z are stacked. X is in the middle. V is just above X. Z is at the bottom. W is above Y. Which is on top? Practice
Correct answer: (A)
From bottom: Z(1), ?(2), X(3), V(4), ?(5). W above Y ⇒ Y=2, W=5.
From bottom: Z(1), ?(2), X(3), V(4), ?(5). W above Y ⇒ Y=2, W=5.
Q17. Seven people sit in a row facing north. D is exactly in the middle. F is third to the right of D. Where is F? Practice
Correct answer: (B)
D = seat 4; 4 + 3 = 7 = right end.
D = seat 4; 4 + 3 = 7 = right end.
Q18. Question: What is Ram's rank? I. Ram is 3 ranks ahead of Shyam. II. Shyam's rank is 10. Practice
Correct answer: (C)
Together Ram = 7; not alone.
Together Ram = 7; not alone.
Q19. Four friends — Aman, Bablu, Chintu, Deepu — play different games: cricket, hockey, football, tennis. Aman plays neither cricket nor tennis. Bablu plays hockey. Chintu does not play tennis. What does Deepu play? Practice
Correct answer: (D)
Bablu = hockey ⇒ Aman = football; Chintu not tennis ⇒ cricket; Deepu = tennis.
Bablu = hockey ⇒ Aman = football; Chintu not tennis ⇒ cricket; Deepu = tennis.
Q20. Question: In which direction is P from Q? I. P is north of R. II. Q is south of R. Practice
Correct answer: (A)
Q → R → P all northward ⇒ P is north of Q. Not alone.
Q → R → P all northward ⇒ P is north of Q. Not alone.