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If the plane 2x – y + 2z + 3 = 0 has the distances 3 1 and 3 2 units from the planes 4x – 2y + 4z + λ = 0 and 2x – y + 2z + μ = 0, respectively, then the maximum value of λ + μ is equal to :

1. 13
2. 9
3. 5
4. 15

Correct answer: 13

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