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Option 3 : Only III
Consider the following least possible Venn diagram,
[ alt="14 s1 11" src="//storage.googleapis.com/tb-img/production/18/07/14_s1_11.PNG" style="height:152px; width:372px">
Conclusions:
I. Some red are plates → False (It is possible but not definite).
II. Some plates are red → False (It is possible but not definite).
III. Some plates are blue → True (It is definitely true as some blue are plates).
Hence, only III follows.
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