Logical Deduction

Directions to SolveIn each question below are given two statements followed by two conclusions numbered I and II. You have to take the given two statements to be true even if they seem to be at variance from commonly known facts. Read the conclusion and then decide which of the given conclusions logically follows from the two given statements, disregarding commonly known facts.Give answer:
  • (A) If only conclusion I follows
  • (B) If only conclusion II follows
  • (C) If either I or II follows
  • (D) If neither I nor II follows and
  • (E) If both I and II follow.

Q1: Statements: All mangoes are golden in colour. No golden-coloured things are cheap. Conclusions:
  1. All mangoes are cheap.
  2. Golden-coloured mangoes are not cheap.

A Only conclusion II follows

B Both I and II follow

C Only conclusion I follows

D Neither I nor II follows

E Either I or II follows

ANS:B - Only conclusion II follows

Explanation: Clearly, the conclusion must be universal negative and should not contain the middle term. So, it follows that 'No mango is cheap'. Since all mangoes are golden in colour, we may substitute 'mangoes' with 'golden-coloured mangoes'. Thus, II follows.



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