Discussion
Whichever book Mr. A reads, Mr. B also reads that book. Whichever book Mr. B reads, Mrs. C also reads that book. Which of the following must be true ?
Answer: C
The statement that must be true is Mrs. C has not read the autobiography of Mahatma Gandhi. Mr. A could not have read it either.
Every book A reads, B reads, and every book B reads, C reads. So every book A has read, C has also read. If C has not read a book, A cannot have read it, which is the contrapositive of that chain; the third statement is therefore certain.
The others reverse the direction of the rule. B not reading a book says nothing about C, who may read books B has not. B reading Harry Potter does not mean A did, and C reading all of Coelho does not mean A did, because the rule carries books only from A to B to C, not back.
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