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If the shortest distance between the lines x 2 − λ − = y 2 1 − = z 1 1 − and x 3 1 − = y 1 2 − − = z 2 1 − is 1, then the sum of all possible values of λ is :

1. 0
2. 2 3
3. 3 3
4. –2 3

Correct answer: 2 3

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