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If the two lines x + (a – 1) y = 1 and 2x + a 2 y = 1 (a ∈ R –{0, 1}) are perpendicular, then the distance of their point of intersection from the origin is :

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

Correct answer: 5 2

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