Question 1
Eight persons A, D, C, B, H, E, F and G are sitting around a square table.
Four persons sit at corners and four at the middle of sides, all facing the center.
A sits at a corner. D sits second to the right of A.
C sits at the middle of a side and is not adjacent to A.
B sits opposite to A. H sits at a corner immediately to the right of C.
E sits immediately to the left of D. F is not adjacent to B.
How many persons sit between A and B when counted from the left of A?
Solution Approach:
Step 1: Draw square table diagram
Positions clockwise (C=Corner, M=Midpoint):
C1(1) β M1(2) β C2(3) β M2(4) β C3(5) β M3(6) β C4(7) β M4(8) β back to C1
Corner positions: 1, 3, 5, 7
Midpoint positions: 2, 4, 6, 8
Opposite corners: pos1βpos5, pos3βpos7
Step 2: Place persons systematically
- A sits at a corner β pos 1
- D sits second to the RIGHT of A: right(center-facing)=CW
2 CW from pos 1 β pos 3 β (corner)
- B sits OPPOSITE A (pos 1) β pos 5 β
- C at midpoint, NOT adjacent to A(pos 1):
Adjacent to pos 1: pos 8 and pos 2
C β pos 6 (midpoint, not adjacent) β
- H sits at corner immediately to the RIGHT of C(pos 6):
1 CW from pos 6 β pos 7 (corner) β
Step 3: Remaining persons
Remaining: E, F, G
Fill remaining seats: pos2=E, pos8=F, pos4=G
Final Arrangement (clockwise):
pos1:A β pos2:E β pos3:D β pos4:G β pos5:B β pos6:C β pos7:H β pos8:F
Step 4: Count from LEFT of A to B
Left = anti-clockwise direction from A(pos 1):
pos1(A) β pos8(F) β pos7(H) β pos6(C) β pos5(B)
Persons between (excluding A and B): pos8(F), pos7(H), pos6(C)
Count = 3 person(s)
Answer: Three person(s) sit between A and B.
Step 1: Draw square table diagram
Positions clockwise (C=Corner, M=Midpoint):
C1(1) β M1(2) β C2(3) β M2(4) β C3(5) β M3(6) β C4(7) β M4(8) β back to C1
Corner positions: 1, 3, 5, 7
Midpoint positions: 2, 4, 6, 8
Opposite corners: pos1βpos5, pos3βpos7
Step 2: Place persons systematically
- A sits at a corner β pos 1
- D sits second to the RIGHT of A: right(center-facing)=CW
2 CW from pos 1 β pos 3 β (corner)
- B sits OPPOSITE A (pos 1) β pos 5 β
- C at midpoint, NOT adjacent to A(pos 1):
Adjacent to pos 1: pos 8 and pos 2
C β pos 6 (midpoint, not adjacent) β
- H sits at corner immediately to the RIGHT of C(pos 6):
1 CW from pos 6 β pos 7 (corner) β
Step 3: Remaining persons
Remaining: E, F, G
Fill remaining seats: pos2=E, pos8=F, pos4=G
Final Arrangement (clockwise):
pos1:A β pos2:E β pos3:D β pos4:G β pos5:B β pos6:C β pos7:H β pos8:F
Step 4: Count from LEFT of A to B
Left = anti-clockwise direction from A(pos 1):
pos1(A) β pos8(F) β pos7(H) β pos6(C) β pos5(B)
Persons between (excluding A and B): pos8(F), pos7(H), pos6(C)
Count = 3 person(s)
Answer: Three person(s) sit between A and B.