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If a vector 21+ 3+ 8k is perpendicular to the vector 4- 4 + ak, then the value of a is (b)-1/2 (d)-1 (a)

If a vector 21+ 3+ 8k is perpendicular to the vector 4- 4 + ak, then the value of a is (b)-1/2 (d)-1 (a) 1/2 (c) 1

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