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Determinant (Page: 2)
Question No: # 13
The determinant $ \begin{vmatrix} a & b & a\alpha+b \\ b & c & b\alpha+c \\ a\alpha+b & b\alpha+c & 0 \end{vmatrix} = 0 $ if `a, b, c` are in -- (a) A.P. (b) G.P. (c) H.P. (d) None of these.
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