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Logical Deduction - Verbal and Reasoning

Directions to SolveIn each of the following questions, three statements are given followed by four conclusions numbered I, II, III and TV. You have to take the given statements to be true even if they seem to be at variance with commonly known facts and then decide which of the given conclusions logically follows from the given statements disregarding commonly known facts.
Q1:

Statements: Some tapes are discs. Some discs are cassettes. Some cassettes are songs. Conclusions:
  1. Some songs are discs.
  2. Some cassettes are tapes.
  3. Some songs are tapes.
  4. No song is a disc.

A Only either I or IV follows

B Only either II or IV follows

C Only III and IV follow

D Only III and either II or IV follows

E None of these

ANS:A - Only either I or IV follows

Explanation: Since each combination of premises shall contain two particular premises, no definite conclusion can be drawn. However, I and IV involve the extreme terms of the second and third premises and form a complementary pair. Thus, either I or IV follows.