Four of the following five persons live on prime-numbered floors in a nine-storey building (1st floor is ground floor). Identify the person who does NOT live on a prime-numbered floor:

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**Solution:**

1. The building has 9 floors numbered from 1 (ground floor) to 9 (top floor).

2. Prime-numbered floors among these are 2, 3, 5, and 7.

3. According to the puzzle, four persons live on prime-numbered floors, and one does not.

4. From the given data, all except person A live on prime-numbered floors.

5. Therefore, person A is the one who does not belong to the group living on prime-numbered floors.

**Answer:** (d) A

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