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Question Number 15193 by arnabpapu550@gmail.com last updated on 08/Jun/17

The value of the determinant

△ = | \begin{matrix} 2 a_{1} b_{1} & a_{1} b_{2} + a_{2} b_{1} & a_{1} b_{3} + a_{3} b_{1} \\ a_{1} b_{2} + a_{2} b_{1} & 2 a_{2} b_{2} & a_{2} b_{3} + a_{3} b_{2} \\ a_{1} b_{3} + a_{3} b_{1} & a_{3} b_{2} + a_{2} b_{3} & 2 a_{3} b_{3} \end{matrix} | is