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If the shortest distance between the lines 3 – z 2 1 y 1 4 – x = + = and 5 – 2 – z 4 1 y 2 – x = + = λ is 5 6 , then the sum of all possible values of λ is :

1. 7
2. 10
3. 5
4. 8

Correct answer: 8

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