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If the graph of f(x)=x^2 +(3-k)x+k, (whe...

If the graph of `f(x)=x^2 +(3-k)x+k,` (where `kepsilon R`) lies above and below x-axis, then `k` cannot be (i) `1` (ii)`0` (iii) `-1` (iv) `10`

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