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এবং Q= [1 1 1] হলে, PQ = ?

[\begin{matrix} 1 \\ 1 \\ 1 \end{matrix}]

[\begin{matrix} 1 & - 1 & 1 \\ 1 & - 1 & 1 \\ 1 & - 1 & 1 \end{matrix}]

[3]

[- \begin{matrix} 1 & 1 & 1 \\ 1 & - 1 & - 1 \\ 1 & 1 & 1 \end{matrix}]

ANS : 4

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