Answers

2014-07-07T20:40:04+05:30
Answer is (r+t)(a+B)..

0
ar+br+at+bt =r(a+b)+t(a+b) =(a+b)(r+t)
2014-07-07T20:42:41+05:30
Ar+br+at+bt
= r(a+b)+t(a+b)
=(a+b) (r+t)
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