Data Sufficiency — Who Is Tallest? (P, Q, R, S, T) Who among P, Q, R, S, T is the tallest? I. P is taller than S and T but shorter than R. Q is taller than S. II. T is taller than S. P is not the tallest.

Introduction / Context:
We have partial height comparisons and must identify the tallest uniquely.

Given Data / Assumptions:

• I: R > P > {S,T}; and Q > S. No relation between Q and R or Q and P is fixed.
• II: T > S; and P is not the tallest.

Concept / Approach:
From I, R or possibly Q could be tallest (since Q is only constrained above S). II only says P is not tallest and gives T > S, which does not settle R vs Q vs others.

Step-by-Step Solution:

Verification / Alternative check:
Attempting to force a unique tallest fails without an explicit Q–R comparison.

Why Other Options Are Wrong:
I alone or II alone insufficient; together also insufficient; “either alone sufficient” is false.

Common Pitfalls:
Assuming transitivity where no link exists (e.g., inferring Q vs R).

Final Answer:
Not sufficient even together.