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Determine the contrapositive of each of the following statements: (i)If `x` is less than zero then `x` is not positive (ii)If he has courage, then he will win. (iii)It is necessary to be strong in order to be a sailor.

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(i)If x is positive, then x is not less than zero.
(ii) If he does not win, then he does not have courage.
(iii) If he is not strong, then he is not a sailor.
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