To determine the siblings among P, Q, R, S, and T, we need to use the given constraints and the acceptable room allocations. The key points are:

From the above allocations:

Since S and Q cannot have siblings, we can remove options that include them:

Now, let's check the remaining options:

Option A: P and T
In both valid allocations, P and T are never in the same room:
- PR | TS | Q (P is with R, and T is with S)
- PQ | RT | S (P is with Q, and T is with R)
So, this is a valid combination.

Option D: T and R
In the second allocation:
- PQ | RT | S
T and R are in the same room, so this option is invalid.

Therefore, the correct option is:

Option A: P and T

Logical Reasoning · General Aptitude · GATE ECE

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