1.

Let a,b,c are positive real numbers such that p =a ^(2) b + ab ^(2) c - ac ^(2), q =b ^(2) c+bc^(2) -a ^(2)b-ab ^(2) and r =ac ^(2) +a^(2) c - cb^(2) - bc ^(2) and the quadratic equation px ^(2) +qx+r=0 has equal roots , then a,b,c are in :

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A.P.
G.P.
H.P.
None of these

ANSWER :C


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