Write down the contrapositive of the following statements:
(i) If all three sides of a triangle are equal, then the triangle is equilateral.
(ii) If and are negative integers, then is positive

Solution:

(i) It is known to us that a conditional statement is logically equivalent to its contrapositive.

Contrapositive: If the triangle isn’t equilateral, then all the 3 sides of the triangle aren’t equal.

(ii) It is known to us that a conditional statement is logically equivalent to its contrapositive.

Contrapositive: If isn’t positive integer, then or isn’t negative integer.