Write the negation of the following statements and check whether the resulting statements are true,(i)         Australia is a continent.(ii)        There does not exist a quadrilateral which has all its sides equal,(iii)       Every natural number is greater than 0.(iv)       The sum of 3 and 4 is 9.

Explanation

(i) false

Australia is not a continent (true)

(ii) false

there exist a quadrilateral which has all its side equal (true)

(iii) true

not every natural no is greater than zero (false)

(iv) false

sum of 3 & 4 is not 9. (true)