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Let the line passing through the points P(2, –1, 2) and Q(5, 3, 4) meet the plane x – y + z = 4 at the point R. Then the distance of the point R from the plane x + 2y + 3z + 2 = 0 measured parallel to the line 1 2 z 2 3 y 2 7 x      is

1. 61
2. 189
3. 31
4. 3

Correct answer: 3

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