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If the straight lines 2x+3y-1=0,x+2y-1=0...

If the straight lines `2x+3y-1=0,x+2y-1=0`,and `a x+b y-1=0` form a triangle with the origin as orthocentre, then `(a , b)` is given by (a) `(6,4)` (b) `(-3,3)` (c) `(-8,8)` (d) `(0,7)`

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