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Let S be the set of all values of λ , for which the shortest distance between the lines 1 6 z 4 3 y 0 x + = − = λ − and 0 6 z 4 y 3 x − = − = λ + is 13. Then ∑ ∈ λ λ S 8 is equal to-

1. 306
2. 304
3. 308
4. 302

Correct answer: 306

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