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Let the circumcentre of a triangle with vertices A(a, 3), B(b, 5) and C(a, b), ab > 0 be P(1, 1). If the line AP intersects the line BC at the point Q(k 1 , k 2 ), then k 1 + k 2 is equal to :

1. 2
2. 7 4
3. 7 2
4. 4

Correct answer: 7 4

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