AhmedNazir

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Option 1 : Only conclusion I follows

The least possible Venn diagram is: 

I. All pens are files. → True (As, All pens are erasers and All erasers are files → All pens are files)

II. All pens are books. → False (As, All books are pens → Some pens are books)

III. All files are books.→ False (As, All books are pens, All pens are erasers and All erasers are files → Some files are books)

IV. All files are pens. → False (As, All pens are erasers and All erasers are files → Some files are pens)

Hence, Only conclusion I follows.

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