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[" Let "ABC" be a triangle.Let "A" be th...

[" Let "ABC" be a triangle.Let "A" be the point "(1,2),y=x" be the perpendicular biserve of "AB],[" and "x-2y+1=0" be the angle bisector of "/_C" .If the equation of "BC" is given by "],[ax+by-5=0" ,then the value of "a+b" is "],[[" 1) "1," 2) "2," 3) "3," 4) "4]]

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Let A B C be a triangle. Let A be the point (1,2),y=x be the perpendicular bisector of A B , and x-2y+1=0 be the angle bisector of /_C . If the equation of B C is given by a x+b y-5=0 , then the value of a+b is (a)1 (b) 2 (c) 3 (d) 4

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