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Let a = 4i + 5j - k, b = i - 4j + 5k and c = 3i + j-k. Find a vector d which is perpendicular to both c and b and d . a = 21.

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Let a = 4i + 5j - k, b = i - 4j  + 5k and c = 3i + j-k. Find a vector d  which is perpendicular to both c  and b and d . a  = 21.

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