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Option 4 : None follows
Consider the following least possible Venn diagram,
[ alt="rrb je me 23 12" src="//storage.googleapis.com/tb-img/production/19/05/rrb%20je%20me%2023_%2012.PNG" style="width: 215px; height: 81px;">
Conclusions:
I. No metal is pin → False (It is possible but not definite.)
II. Some pin are gold → False (It is possible but not definite.)
III. Some gold are silver → False (It is possible but not definite.)
Hence, none of the conclusions follows.
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