# WBSET: Philosphy MCQs (Practice_Test 26 of 90)

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- Which one of the following is deduced from (~pq) [ (r. s) -p] . r
- ~q
- ~q-r
- ~s
- r-s

- Following is a normal proof of validity:
- p- (q. r)
- (p-r) (q-s) . /- ~r-s
- (p-r) (q-r) .
- p-q
- r-s
- ~r-s

Which of the following sequence of rules has been used to derice the conclusion from lines 3 − 5?

- Importation, Simplification, Constructive Dilemma, Definition of Implication
- Distribution, Addition, Constructive Dilemma, Disjunctive Syllogism
- Importation, Simplification, Hypothetical Syllogism, Disjunctive Syllogism
- Distribution, Simplification

Constructive Dilemma, Definition of

Implication

- Which one of the following statements follows from the proposition ‘Logic is difficult’
- Assuming either that logic is difficult or that the text is not readable, Alfred will pass only if he concentrates
- Logic is difficult if and only if it is not difficult
- Unless logic is difficult, Alfred will pass if he concentrates
- Logic is difficult just in case Alfred will pass if he concentrates