Statements:
Some silks are fibres.
No fibre is a polyesters.
Some polyesters are nylons.
Conclusion:
I. Somesilks are not polyesters.
II. Some nylons are fibres.
III. Some polyesters are fibres.
Some silks are fibres. (I) + No fibre is a polyesters. (E) Some silks are not polyesters. (O). Hence conclusion I follows. No fibre is a polyesters. (E) + Some polyesters are nylons. (E) Some nylons are not fibres. (O*). Hence conclusion II does not follow. No fibre is a polyesters. (E) Conversion Some polyesters are not fibres. (O). Hence conclusion III does not follow.
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