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If the line 1 1 z 2 1 y 3 2 x − − = + = − intersects the plane 2x + 3y – z+13 = 0 at a point P and the plane 3x + y + 4z = 16 at a point Q, then PQ is equal to :

1. 7 2
2. 14
3. 14 2
4. 14

Correct answer: 14 2

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