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Question

Write the negation of the following statements:
(i) p : For every positive real number x the number x1 is also positive
(ii) q : All cats scratch
(iii) r : For every real number x, either x>1 or x<1
(iv) s : There exist a number x such that 0<x<1

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Solution

(i) The negation of statement p is as follows
There exists a positive real number x such that x1 is not positive
(ii) The negation of statement q is as follows
There exists a cat that does not scratch
(iii) The negation of statement r is as follows
There exists a real number x such that neither x>1 nor x<1
(iv) The negation of statement s is as follows
There does not exist a number x such that 0<x<1

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