$(\overrightarrow{\mathbf{A}}+\overrightarrow{\mathbf{B}})+\overrightarrow{\mathbf{C}}=\overrightarrow{\mathbf{A}}+(\overrightarrow{\mathbf{B}}+\overrightarrow{\mathbf{C}})$ এটি ভেক্টর-

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