Answers

2016-04-07T18:24:00+05:30
1-1=0,2-2=0,3-3=0...........
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2016-04-07T18:39:07+05:30
X and x ⇒ x - x = 0
5 and 5 ⇒ 5 - 5 = 0
1 and 1⇒ 1 - 1 = 0
ab and ba ⇒ ab - ba = 0
A term and the same term are the pairs whose difference is 0
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