Question: 14. Let a = i- j + 2k, b =2i - j + 2k, c = 3i - 3j + 6k, d = -21 +

14. Let a = i- j + 2k, b =2i - j + 2k, c = 3i - 3j + 6k, d = -21 + 2j - 4k. (a) Which vectors are parallel? (b) Which vectors have the same direction? (c) Which vectors have opposite directions

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