Word-formation count: Using each letter only once, how many meaningful English words can be formed from the letters I, F, E, L?

Introduction / Context:
From the letter set I, F, E, L (one each), determine how many everyday English words can be formed without repeating letters. Such problems test flexible word recognition and systematic checking of permutations.

Given Data / Assumptions:

• Letters: {I, F, E, L}.
• Use each letter exactly once per word.
• Count standard dictionary words only (no names, abbreviations).

Concept / Approach:
Two common words are immediately visible: LIFE and FILE. Each uses all four letters once, and both are frequent in everyday English. Other permutations such as “lief” also exist; however, “lief” is archaic/poetic and typically excluded in aptitude-test conventions favoring contemporary usage. Therefore, the accepted count is two.

Step-by-Step Solution:
1) Try common arrangements: LIFE ✓, FILE ✓.2) Evaluate variants: LIEF (archaic) generally excluded from “meaningful” in test context.3) Conclude that two standard words satisfy the constraint.

Verification / Alternative check:
Most exam keys treat “meaningful words” as everyday vocabulary entries. Under that norm, LIFE and FILE are counted; archaic or poetic forms like LIEF are not.

Why Other Options Are Wrong:
“None/One” miss at least one valid word; “Three” overstates by including archaic/less-accepted forms.

Common Pitfalls:
Over-including rare or archaic forms; always align with contemporary, general-use dictionaries for such tests.

Final Answer:
Two