S, A, T, Y, B and M are sitting in a row. A and B are at the ends. S and T are in the center. M is sitting to the left of A. Who…

Question

S, A, T, Y, B and M are sitting in a row. A and B are at the ends. S and T are in the center. M is sitting to the left of A.

Who is to the right of Y?

1. A. A
2. B. T
3. C. S
4. D. Data insufficient (Correct answer)

Correct Answer

Option D — Data insufficient

Detailed Solution & Explanation

The correct answer is Data insufficient.

Key Points

• Six seats in a row. *A and B are at the ends*, so they occupy seats 1 and 6.
• *S and T are in the centre*, so they occupy seats 3 and 4 — but the question never says which of them takes which seat.
• *M is sitting to the left of A*, which forces A to seat 6 and B to seat 1; Y and M then fill seats 2 and 5.
• In either arrangement the person to Y's right is not fixed: if Y is at seat 2 the neighbour is whichever of S or T sits at seat 3, and that order was never specified.
• The data are therefore insufficient.

Additional Information

• The unresolved element is the internal order of S and T, not the position of Y — so no amount of case work on Y settles the question.
• When a puzzle pins down a *pair* of people to a *pair* of seats without ordering them, treat any question that depends on that ordering as under-determined.

*Lower confidence:* This rests on reading 'S and T are in the centre' as leaving their order unspecified, which makes the question under-determined rather than calculable. If the Commission intended a fixed order, the key may differ.

*Ministry of Papers worked solution. The Commission has not yet published the official key for this paper; this answer will be reconciled with it on release.*