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Let the equation of plane passing through the line of intersection of the planes x + 2y + az = 2 and x – y + z = 3be 5x – 11y + bz = 6a – 1. For c ∈ Z, if the distance of this plane from the point (a, –c, c) is a 2 , then c b a + is equal to

1. 2
2. 4
3. – 4
4. – 2

Correct answer: – 4

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