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Let the system of equations: 2x + 3y + 5z = 9, 7x + 3y – 2z = 8, 12x + 3y – (4 + λ )z = 16 – μ . have infinitely many solutions. Then the radius of the circle centred at ( λ , μ ) and touching the line 4x = 3y is

1. 5 7
2. 7
3. 5 17
4. 5 21

Correct answer: 5 7

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