Discussion
The question given below has a set of three or four statements. Each set of statements is further divided into three segments. Choose the alternative where the third segment in the statement can be logically deduced using both the preceding two, but not just from one of them.
Statement -
A. Ravens are white. Ravens are good. All good are white.
B. Insects are faster than eagles. All eagles are hawks. Insects are faster than hawks.
C. No boy is a saint. Peter is a boy. Peter is a saint.
Answer: B
Correct answer: B
Test each set by asking whether the third segment follows from both of the first two together, and from neither alone.
A. "Ravens are white" and "Ravens are good" tell you only about ravens. They cannot reach all good things, since there may be good things that are not ravens. Not deducible.
B. "All eagles are hawks" puts every eagle inside the class of hawks, so "faster than eagles" carries across to the hawks in question. Neither segment gives it alone - the first says nothing about hawks, the second nothing about speed. Deducible from the two together.
C. "No boy is a saint" and "Peter is a boy" give the opposite of the third segment: Peter is not a saint. Not deducible.
Only set B works, so the answer is B.
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