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Let P be the plane passing through the points (5, 3, 0), (13, 3, –2) and (1, 6, 2). For   N, if the distances of the points A(3, 4,  ) and B(2,  , a) from the plane P are 2 and 3 respectively, then the positive value of a is 

1. 6
2. 3
3. 5
4. 4

Correct answer: 4

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