Two Statements followed by four Conclusions are given below. You have to take the Statements to be true even if they seem to be at variance from the commonly known facts. Read all the Conclusions and then decide which of the given Conclusions logically follows/follow from the Statements, disregarding the commonly known facts :
Statement-1 : All pens are books.
Statement-2 : No chair is a pen.
Conclusion-I : All chairs are books.
Conclusion-II : Some chairs are pens.
Conclusion-III : All books are chairs.
Conclusion-IV : No chair is a book.
Which one of the following is correct?

Correct Option: None of the Conclusions follows

Let us analyze the statements using Venn diagrams. Statement-1: All pens are books (Pen inside Book). Statement-2: No chair is a pen (Chair and Pen are disjoint). Conclusions: Conclusion-I: All chairs are books (Not necessarily true, chairs could be outside books). Conclusion-II: Some chairs are pens (False, because no chair is a pen). Conclusion-III: All books are chairs (False, no such relation is given). Conclusion-IV: No chair is a book (Not necessarily true, some chairs could overlap with books). Thus, none of the conclusions logically follows. Hence, option (d) is correct.