Question: Find a such that the lines r 1 = (1, 2, 1) + t(1, 1, 1) and r 2 = (3, 1, 1) + t(a,

Find a such that the lines r1 = (1, 2, 1) + t(1, −1, 1) and r2 = (3, −1, 1) + t(a, 4, −2) intersect.

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