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Among the two statements (S 1 ) : (p  q)  p  ~ q)) is a contradiction and (S 2 ) : (p  q)  (( ~ p)  q)  (p  ( ~ q))  (( ~ p)  (~ q)) is a tautology

1. only (S 2 ) is true
2. only (S 1 ) is true
3. both are false
4. both are true

Correct answer: both are true

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