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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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