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The negation of ~s∨(~r∧s) is equivalent to:

1. s∨(r∨~s)
2. s∧r
3. s∧~r
4. s∧(r∧~s)

Correct answer: s∧r

Solution

Negation of ~s v (~r ^ s) = s ^ ~(~r ^ s) = s ^ (r v ~s) = (s^r) v (s^~s) = s ^ r.

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