Standard inner product/R^3/Gram matrix with respect 123, 245, 015/Exercise

Determine the Gram matrix of the standard inner product in ${ℝ}^3$ with respect to the basis $\left(\begin{array}{c}1\\ 2\\ 3\end{array}\right),\left(\begin{array}{c}2\\ 4\\ 5\end{array}\right)$ and $\left(\begin{array}{c}0\\ 1\\ 5\end{array}\right)$.

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