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20 12 is it right to deny the second question in the mathematics (science and engineering) examination paper of Hubei college entrance examination?
Hello, that multiple-choice question examines the knowledge points of the proposition, and the answer options are all correct. I don't think you understand this knowledge point: the negation of full-name proposition is a special proposition, and the negation of special-name proposition is a full-name proposition.

Thank you, I hope my answer can solve your doubts!