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Option 3 : Only III follows

Consider the following least possible Venn diagram,

[ alt="RRB OA MFT6 Neha 3 Aug 2018 40q hindi (R) (Repaired) images Q31" src="//storage.googleapis.com/tb-img/production/18/08/RRB_OA_MFT6_Neha_3%20Aug%202018_40q_hindi%20%28R%29%20%28Repaired%29_images_Q31.PNG">

Conclusions:

I. No Silver is a Metal → False (It is possible but not definite).

II. Some Metal are Mobile → False (It is possible but not definite).

III. No Mobile being a Gold is a possibility → True (Possibility is true).

Hence, only conclusion III follows.
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