Teaching MPPSC Assistant Professor Mock Test Series 2025 Mathematics Vector Algebra Types of Vectors

यदि दो सदिश \(|\vec a|=2, |\vec b|=1\) और \(\vec a.\vec b=1\) हो तो \((3\vec a-5\vec b).(2\vec a+7\vec b)\) का मान क्या है?

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