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Option 4 : Only Conclusion III and IV follow.

Drawing the Venn diagram,

[ alt="F2 S.Y 9.3.20 Pallavi D8" src="//storage.googleapis.com/tb-img/production/20/03/F2_S.Y_9.3.20_Pallavi_D8.png" style="width: 153px; height: 92px;">

Conclusion 1: No watch is tubelight → False (It is possible but not definite)

Conclusion 2: Some bulbs are switches → False (It is possible but not definite)

Conclusion 3: Some tubelights are bulbs → True

Conclusion 4: No watch is bulb → True

Hence, ‘Only conclusion III and IV follow’ is the correct answer.

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