যদি $\overrightarrow{\mathbf{A}}=\mathbf{8 \mathbf { i }}-\hat{\mathbf{j}}-3 \hat{\mathbf{k}}$ এবং $\vec{B}=\hat{i}-4 \hat{j}+\hat{\mathbf{k}}$ হয়, তবে $\overrightarrow{\mathbf{A}} \cdot \overrightarrow{\mathbf{B}}=$ কত?

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