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Let the centre of a circle C be (  ,  ) and its radius r < 8. Let 3x + 4y = 24 and 3x – 4y = 32 be two tangents and 4x + 3y = 1 be a normal to C. Then (  –  + r) is equal to :

1. 7
2. 5
3. 6
4. 9

Correct answer: 7

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