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21. Find a given that 3i + j - k and a i - 4j + 4k are parallel. 22. Find a given that 3i

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21. Find a given that 3i + j - k and a i - 4j + 4k are parallel. 22. Find a given that 3i + j and a j - k have the same length. 23. Find a given that lait (a - 1)j + (a + 1) kl| = 2. 24. Find the vector of norm 2 in the direction of a = i + 2j -k. 25. Find the vectors of norm 2 parallel to a = 3i+ 2k

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