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Let f(x)=(1+m)x^2-2(1+3m)x+4(1+2m). Numb...

Let `f(x)=(1+m)x^2-2(1+3m)x+4(1+2m).` Numbe of interval values of `m` for which given qudratic expression is always positive is (A) `8` (B) `7` (C) `8` (D) `9`

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