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If a hyperbola passes through the point P(10, 16) and it has vertices at (± 6, 0), then the equation of the normal to it at P is :

1. 2x + 5y = 100
2. x + 2y = 42
3. x + 3y = 58
4. 3x + 4y = 94

Correct answer: 2x + 5y = 100

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