In the question three statements are given, followed by three conclusions, I, II and III. You have to consider the statements to be true even if it seems to be at variance from commonly known facts. You have to decide which of the given conclusions, if any, follows from the given statements. Statement I: No marble is granite. Statement II: All stones are marble. Statement III: Some rocks are stones. Conclusion I: Some rocks are granite. Conclusion II: Some marble are rocks. Conclusion III: No stones are granite.

In the question three statements are given, followed by three conclusions, I, II and III. You have to consider the statements to be true even if it seems to be at variance from commonly known facts. You have to decide which of the given conclusions, if any, follows from the given statements. Statement I: No marble is granite. Statement II: All stones are marble. Statement III: Some rocks are stones. Conclusion I: Some rocks are granite. Conclusion II: Some marble are rocks. Conclusion III: No stones are granite. Correct Answer Only conclusions II and III follow 

Based on information given Venn diagram can be drawn as,

[ alt="19.07.2018.009" src="//storage.googleapis.com/tb-img/production/18/07/19.07.2018.009.PNG">

Conclusion I: Some rocks are granite  False

Conclusion II: Some marble are rocks  True

Conclusion III: No stones are granite  True

Hence only conclusions II and III follow.

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