\( A B C \) एक समबाहु त्रिभुज है, जिसका केन्द्र \( O \) है। \( \mathbf{F}_{1}, \mathbf{F}_{2} \)...

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\( A B C \) एक समबाहु त्रिभुज है, जिसका केन्द्र \( O \) है। \( \mathbf{F}_{1}, \mathbf{F}_{2} \) तथा \( \mathbf{F}_{3} \) क्रमशः \( A B, B C \) तथा \( A C \) दिशा में लगे बल हैं। यदि \( O \) के परितः कुल बल आघूर्ण शून्य हो, तो \( F_{3} \) का मान होगा
(A) \( F_{1}+F_{2} \)
(B) \( F_{1}-F_{2} \)
(C) \( \frac{F_{1}+F_{2}}{2} \)
(D) \( Z\left(F_{1}+F_{2}\right) \)
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