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Option 4 : Either conclusion I or II follows

Consider the following least possible Venn diagram,

[ alt="SBI PO Neha 13 Feb 21 Q HinRev Manoj.docx 5" src="//storage.googleapis.com/tb-img/production/20/03/SBI_PO_Neha_13_Feb_21_Q_HinRev_Manoj.docx%205.PNG" style="width: 314px; height: 93px;">

Conclusions:

I. No red is board → False(It is possible but not definite).

II. Some board are red → False (It is possible but not definite).

Since, conclusion I and II form a complementary pair so either of them must be true.

Hence, either conclusion I or II follows.
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