[" (A) "2x],[" The mapping "f:R rarr R" ...

[" (A) "2x],[" The mapping "f:R rarr R" given by "f(x)=x^(3)+ax^(2)+bx+c" is a bijection if "],[[" (A) "b^(2)<=3a," (B) "a^(2)<=3b," (C) "a^(2)>=3b," (D) "b^(2)>=3a]]

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