State 'T' for true and 'F' for false.
(i) The addition and subtraction of integer cannot be represented on the number line.
(ii) For any three integers a, b and c, (a + b) + c = (a + c ) (b + c).
(iii) Under addition, the integer 1 is its identity.
(iv) The product of even number of negative integers is negative.
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