Answer :

The given statement can be written in five different ways as follows-

(i) A natural number is odd **implies** that its square is odd.

(ii) A natural number is odd **only if** its square is odd.

(iii) For the number to be odd, it is **necessary** that its square is odd.

(iv) For the square of a natural number to be odd, it is **sufficient** that the number is odd.

(v) **If** the square of a natural number is not odd, **then** the natural number is not odd.

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