If we form a four-letter meaningful word using the 1st, 3rd, 6th, and 8th letters from the left of the word **'ROOMMATE'** (using each letter only once), what will be the third letter of that meaningful word? If no meaningful word can be formed, mark the answer as **X**. If more than one meaningful word can be formed, mark the answer as **Z**.

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**Solution:**

1. Identify the letters at the 1st, 3rd, 6th, and 8th positions of the word **'ROOMMATE'**:
   - 1st letter: R
   - 3rd letter: O
   - 6th letter: A
   - 8th letter: E

2. The letters to be used are **R, O, A, E**.

3. Now, try to form meaningful four-letter words using these letters without repetition:
   - One such word is **ROAE** (not meaningful)
   - Another is **ROAR** (but 'R' is used twice, which is not allowed)
   - The meaningful word that can be formed is **ROAE** (no), **ROAE** is not a word.
   - Check **ROAE** permutations:
     - OARE (not a word)
     - AERO (meaningful word: AERO)

4. The meaningful word formed is **AERO**.

5. The third letter of **AERO** is **R**.

6. Since only one meaningful word is formed, the answer is the third letter of that word, which is **R**.

**Answer:** R

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