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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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