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[" Q.The determinant "D=|[a,b,a+b],[b,c,...

[" Q.The determinant "D=|[a,b,a+b],[b,c,b+c],[a+b,b+c,0]|],[" A) "a,b,c" are in A.P."],[" B) "a,b,c" are in G.P."],[" C) "a,b,c" are in H.P."],[" D) "alpha" is root of "ax^(2)+2bx+c=0]

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