csatmedium
Four children are sitting in a row. A is occupying the seat next to B but not next to C. If C is not sitting next to D, who is/are occupying seat/seats adjacent to D?
- A.B
- B.A
- C.B and A
- D.Impossible to tell
▶ Answer & Explanation
Correct answer: B. A
The conditions state that A is next to B, but not C. Also, C is not next to D. If we place A next to B, we have two initial possibilities: CABD or BACD. If C is not next to D, then the arrangement must be CABD. In this case, A is adjacent to D. However, if we consider the arrangement DABC, it also satisfies A next to B and A not next to C. In this configuration, B is adjacent to D. Therefore, to determine who is adjacent to D, we need more information.
Source: UPSC csat 2014