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Option 2 : Only conclusion (II) follows

Consider the following least possible Venn diagram,

[ alt="SSCMTS-Answer-Key-17th-September-4-30pm Nita Umang Pratap Singh hindi hrev images Q23" src="//storage.googleapis.com/tb-img/production/18/12/SSCMTS-Answer-Key-17th-September-4-30pm_Nita_Umang%20Pratap%20Singh_hindi_hrev_images_Q23.PNG" style="width: 226px; height: 149px;">

Conclusions:

I. All blue are yellow → False (It is possible but not definite).

II. Some black are yellow → True (It is definitely true as the part of blue which are yellow is also black as all blue are black).

Hence, only conclusion II follows.
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