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যদি

\underset{p}{\to} = 2 i^{\land} + 4 j^{\land} - 5 k^{\land}

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

78.51 °

105.25 °

11.49 °

101.49 °

ANS : 4

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