If \( A D, B E \) and \( C F \) are the medians of \( a \triangle A B C \), then \( \left(A D^{2... VIDEO
If \( A D, B E \) and \( C F \) are the medians of \( a \triangle A B C \), then \( \left(A D^{2}+B E^{2}+C^{2}\right):\left(B C^{2}+C A^{2}+A B^{2}\right) \) is equal to
(A) \( 4: 3 \)
(B) \( 3: 2 \)
(C) \( 3: 4 \)
(D) \( 2: 3 \)
\( \mathrm{P} \)
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