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Logical Deduction

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

Q1: Statements: Some taxis have horns. Some taxis have lights. Conclusions:
  1. Every taxi has either horn or light.
  2. Some taxis have neither light nor horn.
  3. Some taxis have horns as well as lights.
  4. No taxi has horn as well as light.

A Only I and II follow

B Only II and III follow

C Only II and IV follow

D Either III or IV follows

E All follow

ANS:D - Either III or IV follows

Explanation: Since both the premises are particular, no definite conclusion follows. However, III and IV form a complementary pair. Thus, either III or IV follows.



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