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Question
The negation of the statement “Plants take in CO2 and give out O2 ” is ______.
Options
Plants do not take in CO2 and do not give out O2
Plants do not take in CO2 or do not give out O2
Plants take in CO2 and do not give out O2
Plants take in CO2 or do not give out O2
Solution
The negation of the statement “Plants take in CO2 and give out O2 ” is plants do not take in CO2 or do not give out O2.
Explanation:
Let p: Plants take in CO2 and give out O2.
q: Plants take in CO2.
And r: Plants give out O2.
~ q: Plants do not take in CO2.
~ r: Plants do not give out O2.
∴ ~ (q ∨ r) = (~ q ∧ ~ r) : Plants do not take in CO2 or do not give out O2.
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