Data Sufficiency — Word Pattern (“EAST”)? Is the word formed “EAST” after applying the constraints? I. There is only one letter between A and T; E is to the left of A. II. The word does not begin with T. There is only one letter between E and S; T is not an immediate neighbour of E.

Introduction / Context:
We must verify if the four-letter word under constraints is exactly “EAST”.

Given Data / Assumptions:

• I: one letter between A and T; E left of A.
• II: word does not start with T; one letter between E and S; T not adjacent to E.

Concept / Approach:
Each statement alone allows multiple orderings; together they generally allow a unique arrangement that matches “EAST”.

Step-by-Step Solution:

Verification / Alternative check:
Try permutations that satisfy one statement; the other statement eliminates all but EAST.

Why Other Options Are Wrong:
I alone or II alone leave multiple words (not conclusive); “either alone” false; “even both not sufficient” false.

Common Pitfalls:
Miscounting “only one letter between …” or ignoring “not an immediate neighbour”.

Final Answer:
Both statements together are sufficient; neither alone is sufficient.