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c) week
b) >
a)
d) laborious
I'm sure about the week only!
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a) Rivers can not always be used to produce electricity.
b) x < 0.
c) It is false that some students are weak in mathematics.
d) Not all teachers are laborious .
Negation of a statement disagrees with the original statement such that both the statements are opposite to each other.
A statement can be negated by adding "it is false that.." in front of sentence or by using the antonym of a word emphasized in the sentence.
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