Curioustab Logo
Curioustab
More Questions from Logical Deduction

Immediate inference with an exclusion premise: ‘‘Raman is always successful’’ and ‘‘No fool is always successful’’ — decide which conclusion about Raman logically follows.

Verbal Reasoning Logical Deduction Difficulty: Easy
Choose an option
  • A
    Only conclusion I follows
  • B
    Only conclusion II follows
  • C
    Either I or II follows
  • D
    Neither I nor II follows
  • E
    Both I and II follow

Answer

Correct Answer: Only conclusion II follows

Explanation

Map the universal negative to Raman.

  • Premise 1: Raman is always successful.
  • Premise 2: No fool is always successful.
  • Conclusions: I. Raman is a fool. II. Raman is not a fool.
Concept/ApproachPremise 2 states that membership in the class Fools excludes being always successful. Since Raman is always successful, Raman cannot be a member of that class.DerivationFrom Premise 2: Fool ⟶ Not always successful. Contrapositive style reading with Raman being always successful gives: Raman is not a fool. So II follows, I does not.Verification/AlternativeVenn viewpoint: the region Always successful is disjoint from Fools; Raman is placed in the Always successful region, so he is outside Fools.Common pitfallsIgnoring the exclusion and thinking both could hold together, which violates Premise 2.Final AnswerOnly conclusion II follows.
← Previous Next Question →
Discussion & Comments
No comments yet. Be the first to comment!
Join Discussion