# If in parallelogram ABCD, diagonal vectors are AC = 2i + 3j + 4k and BD = -6i + 7j - 2k,

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If in parallelogram ABCD, diagonal vectors are AC = 2i + 3j + 4k and BD = -6i + 7j - 2k, then find the adjacent side vectors AB and AD

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ABCD is a parallelogram

Adding (1) and (2), we get