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Q.2 For a=-12 and b=4 and c =-25 find whether () a and b are closed under addition (ii) a+b=b+a (iii) a-b=b-a Q.3 Find a pair of integers whose (a) Sum is -9 (b) Difference is -16 (c) Sum is -100 Q.4 Find a negative integer and a positive integer whose sum is -10. Q.5 The sum of two integers is -156 If one of the integers is -283 find the other​