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

\underset{D A}{\to} = \underset{D F}{\to} + \underset{D E}{\to}

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

\underset{A D}{\to} = \underset{B E}{\to} + \underset{C F}{\to}

ANS : 2

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