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(i) A natural number is odd implies that its square is odd. <br> (ii) A natural number is odd only if its square is odd. <br> (iii) For a natural number to be odd it is necessary that its square is odd. <br> (iv) For the square of a natural number to be odd, it is sufficient that the number is odd <br> (v) If the square of a natural number is not odd, then the natural number is not odd.Related Video