Statements: All rankers are intelligent. All intelligent people are smart. Some intelligent are dark.



The question contains some statements followed by some conclusions. Decide which of the given conclusions logically follow from the given statements, disregarding commonly known facts.
Statements :
All rankers are intelligent.
All intelligent people are smart.
Some intelligent are dark.
Conclusions :
I. No ranker is a smart.
II. Some dark are rankers.
III. Some smart are dark.
IV. Some rankers are smart.

A. Only I follows

B. Only II follows

C. Only I, II and IV follows

D. Either I or IV follows

E. None of these

Answer : D. Either I or IV follows

Explanation:

  • Conclusion I, negative, follows. Conclusion II, positive, does not follow. Conclusion III, positive, does not follow. Conclusion IV, positive, does not follow.
  • As negative conclusion follows, let us try to negate through an alternate diagram. The negation of conclusion I is “Some rankers are smart”. Conclusion I is negated, hence I does not follow, but conclusion IV which did not follow earlier follows now. Either I or IV follows.

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