Statements :
Some files are folders.
Some folders are envelopes.
Some envelopes are letters.
Conclusions:
I. Some letters are folders.
II. Some files are envelopes.
III. Some envelopes are folders.
Some folders are envelopes(I) + Some envelopes are letters(I) ⇒ No conclusion. Hence conclusion I does not follow. Some files are folders(I) + Some folders are envelopes(I) ⇒ No conclusion. Hence conclusion II does not follow. Some folders are envelopes(I) ⇒ Conversion ⇒ Some envelopes are folders (I). Hence conclusion III follows. ALTERNATE METHOD: