The contradiction of a statement is called the negation of a statement. The phrases like here exists” and “for every” are the quantifiers.
(i)
The given statement is: There exists a number which is equal to its square.
The quantifier in the given statement is “there exists”.
The negation of the given statement is: There does not exist a number which is equal to its square.
(ii)
The given statement is: For every real number x, x is less than
The quantifier in the given statement is “for every”.
The negation of the given statement is: There exist a real number x such that x is not less than
(iii)
The given statement is: There exists a capital for every state in India.
The quantifier in the given statement is “there exists”.
The negation of the given statement is: There exists a state in India which does not have a capital.