(a) If x is nonnegative, then x is positive or x is 0.

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(a) Negotation

x is negative and x is not positive and x is not 0.

(b) Contrapositive

If x is not positive and x is not 0, then x is not nonnegative.

If x is positive or x is 0, then x is nonnegative.

(d) Inverse

If x is not nonnegative, then both x is not positive and x is not 0.

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