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If vertices of a triangle ABC are A(1, 2...

If vertices of a triangle `ABC` are `A(1, 2), B(3, 4)` and `C(-5, 3)` and its orthocentre is `O`, then reflecton of orthocentre of triangle `OBC` w.r.t. line `y = x` will be `(a,b)` then `a + b` is equal to

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