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If vector a and vector b are reciprocal vectors, then (A) a .b = 0 (B) a.b = −1

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If vector a and vector b are reciprocal vectors, then 

(A) a .b = 0 

(B) a.b = −1 

(C) a.b = 1 

(D) None of these

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Answer is (C) a.b = 1

If a and  b are reciprocal, then

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