The least value of \( k \) for which \( f(x)=x^{2}+k x+1 \) is incr...

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The least value of \( k \) for which \( f(x)=x^{2}+k x+1 \) is increasing on \( (1,2) \), is
(a) \( -2 \)
(b) \( -1 \)
(c) 1
(d) 2
\( \mathrm{P} \)
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