Ononot — Find the determinant of \begin{pmatrix} 1 & 1 & 1 & 1 \\ 1 &

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Determinantshard

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Find the determinant of $\begin{pmatrix} 1 & 1 & 1 & 1 \\ 1 & 2 & 3 & 4 \\ 1 & 3 & 6 & 10 \\ 1 & 4 & 10 & 20 \end{pmatrix}$ .