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△ABC এর ক্ষেত্রে কোনটি সঠিক?

\underset{A B}{\to} + \underset{B C}{\to} = \underset{C A}{\to}

\underset{A B}{\to} + \underset{A C}{\to} = \underset{B C}{\to}

\underset{C B}{\to} + \underset{B A}{\to} + \underset{C A}{\to} = 0

\underset{A B}{\to} + \underset{A C}{\to} + \underset{B C}{\to} = 0

ANS : 4

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