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( a ) Write a formal negation for each of the following statements: i . A A fish x , x has gills. ii .
a Write a formal negation for each of the following statements:
i fish has gills.
ii computers has a CPU.
iii. a movie such that is over hours long.
iv a band such that has won at least Grammy awards.
b Write an informal negation for each of the following statements. Be careful to avoid negations that are ambiguous.
i All dogs are friendly.
ii All people are happy.
iii. Some suspicions were substantiated.
iv Some estimates are accurate.
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