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For any three positive real numbers `a , b` and `c ,9(25 a^2+b^2)+25(c^2-3a c)=15 b(3a+c)` Then : (1)`a ,b` and`c` are in`AP` (2) `a ,b` and `c` are in `GP` (3)`b ,c` and `a` are in `GP` (4) `b , c` and `a` are in `AP`

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