Find which if any of the following pairs of vectors are


Question: Find which, if any, of the following pairs of vectors are orthogonal:

(a) 2i + j + k, 8i + 2j + 2k.

(b) i + 2j + 3k, 2i - 2j - 3k.

(c) i + 2j + 4k, 2i + j + 3k.

(d) i + j, 2j + 3k.

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Mathematics: Find which if any of the following pairs of vectors are
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