Calculate determinant 1, 2, 2 2 2 2 2 … 2 2 2 3 … 2 … … … … … 2 2 2 … n
Dn =
Ri-r2, I = 1,3,4,..., n all lines minus the second line
-1 0 0 ...0
2 2 2 ...2
0 0 1 ...0
......
0 0 0 ...n-2
= -2(n-2)!
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