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Three Statements are given followed by four conclusions numbered I, II, III and IV. Assuming the statements to be true, even if they seem to be at variance with commonly know facts, decide which of the conclusions logically follow (s) from the statements. Statements: Some bulbs are tubelights. No tubelight is switch. No bulb is watch. Conclusions: I. No watch is tubelight. II. Some bulbs are switches. III. Some tubelights are bulbs. IV. No watch is bulb. 

Three Statements are given followed by four conclusions numbered I, II, III and IV. Assuming the statements to be true, even if they seem to be at variance with commonly know facts, decide which of the conclusions logically follow (s) from the statements. Statements: Some bulbs are tubelights. No tubelight is switch. No bulb is watch. Conclusions: I. No watch is tubelight. II. Some bulbs are switches. III. Some tubelights are bulbs. IV. No watch is bulb.  Correct Answer Only Conclusion III and IV follow.

Drawing the Venn diagram,

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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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