Answers

2014-01-28T14:56:02+05:30
If we substitute (1,-2) in the eq.ax+by+c=0,we get 2b=a+c which is A.P rule.
so,d is the answer...

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Is there any other method for solving this question? How could we solve this without the options?
2014-01-30T19:48:21+05:30
I think 1,-2 can be the answer....
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