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\underset{A}{\to} ও \underset{B}{\to}

\underset{A}{\to} \times \underset{B}{\to} = \underset{B}{\to} \times \underset{A}{\to}

\underset{A}{\to} \times \underset{B}{\to} = - \underset{B}{\to} \times \underset{A}{\to}

কোনটিই নয়

A ও B উভয়ই

ANS : 2

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