How many meaningful English words can be formed using the first, third, sixth, and seventh letters of the word **RECOGNIZE** (when counted from left to right) using all the letters but each letter only once in each word?

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**Solution:**

1. Identify the letters from the given positions in the word **RECOGNIZE**:
   - 1st letter: R
   - 3rd letter: C
   - 6th letter: N
   - 7th letter: I

2. The letters to be used are **R, C, N, I**.

3. We need to form meaningful English words using all these letters exactly once.

4. Check possible permutations:
   - CRIN: This is a meaningful English word meaning horsehair or stiff fabric.
   - Other permutations like RINC, RICN, CNRi, etc., do not form meaningful English words.

5. Therefore, only one meaningful English word can be formed.

**Answer:** One

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