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\bar{A}

\bar{B}

পরস্পর লম্ব হবে যদি-

\bar{A} . \bar{B} \neq 0

\bar{A} \times \bar{B} = 0

\bar{A} \times \bar{B} = A B

\bar{A} \times \bar{B} = \bar{k}

ANS : 3

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