QB_PH_GA_022: Analytical & Spatial Aptitude

Five students A, B, C, D, and E sit in a straight row facing North. C sits in the exact middle. A sits at the extreme left end. B is an immediate neighbor of both C and E. Who sits at the extreme right end?

Correct Answer

### Step-by-Step Derivation & Verification: 1. **Five Positions**: Label from left to right as $1, 2, 3, 4, 5$. 2. **Fixed Clues**: - 'A sits at the extreme left end' $\implies \text{Pos } 1 = A$. - 'C sits in the exact middle' $\implies \text{Pos } 3 = C$. 3. **Neighbor Constraint**: 'B is an immediate neighbor of both C and E': - This requires the triplet $C-B-E$ or $E-B-C$. - Since Pos 1 is already $A$, $B$ cannot be at Pos 2 (as that would require $E$ at Pos 1). - Therefore, $B$ must be at Pos 4, which places $E$ at Pos 5. 4. **Remaining Position**: The remaining student $D$ must occupy Pos 2. 5. **Complete Row**: $A - D - C - B - E$. 6. **Extreme Right**: Position 5 is occupied by $E$. Option (A) is correct.