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Question
Write the negation of the following.
11 < 15 and 25 > 20
Solution
Let p: 11 < 15, q: 25 > 20
Then the symbolic form of the given statement is p ∧ q.
Since ∼ (p ∧ q) ≡ ∼ p ∨ ∼ q, the negation of the given statement is:
11 ≥ 15 or 25 ≤ 20.
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