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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: All buildings are windows. No toys is building. Some tigers are toys. Conclusions:
  1. Some tigers are buildings.
  2. Some windows are tigers.
  3. All toys are tigers.
  4. Some windows are toys.

A None follows

B Only I and II follow

C Only III and IV follow

D Only I and III follow

E All follow

ANS:A - None follows

Explanation: No toy is building. All buildings are windows. Since the middle term 'buildings' is distributed twice and one premise is negative, the conclusion must be particular negative and should not contain the middle term. So, it follows that 'Some windows are not toys'. Some tigers are toys. No toy is building. Since one premise is particular and the other premise is negative, the conclusion must be particular negative and should not contain the middle term. So, it follows that 'Some tigers are not buildings'.