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\underset{a}{\to} = i^{\land} + 2 j^{\land} - 3 k^{\land}

\underset{b}{\to} = 3 i^{\land} - j^{\land} + 2 k^{\land}

হলে, নিম্নের কোনটি সত্য ?

\underset{a}{\to} . \underset{b}{\to} = 0

\underset{a}{\to} \land \underset{b}{\to} = 0

(\underset{a}{\to} + \underset{b}{\to}) . (\underset{a}{\to} - \underset{b}{\to}) = 0

(\underset{a}{\to} + \underset{b}{\to})^{\land} (\underset{a}{\to} - \underset{b}{\to}) = 0

ANS : 3

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