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Higher Secondary Question Paper Solution of Year 2018 Question No: A.1.(d)(i)

যদি \(\overrightarrow a, \overrightarrow b, \overrightarrow c\) তিনটি ভেক্টর এমন যে \(\overrightarrow a+ \overrightarrow b + \overrightarrow c = 0\) এবং \(| \overrightarrow a | = 3, | \overrightarrow b | = 4, | \overrightarrow c | = 5\) হলে দেখাও যে \(\overrightarrow a . \overrightarrow b + \overrightarrow b . \overrightarrow c + \overrightarrow c.\overrightarrow a = -25\)

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