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 fishes are grey in colour. Some fishes are heavy. Conclusions:
  1. All heavy fishes are grey in colour.
  2. All light fishes are not grey in colour.

A Both I and II follow

B Either I or II follows

C Neither I nor II follows

D Only conclusion II follows

E Only conclusion I follows

ANS:A - Only conclusion I follows

Explanation: Since one premise is particular, the conclusion must be particular and should not contain the middle term. So, it follows that 'Some heavy things are grey in colour'. I is a cumulative result of this conclusion and the first premise. Thus, only I holds.

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