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Mathematics
Problem
The least value of
k
k
k
for which the function
x
2
+
k
x
+
1
x^2 + kx + 1
x
2
+
k
x
+
1
is an increasing function in the interval
1
<
x
<
2
1 < x < 2
1
<
x
<
2
is (a) -4 (b) -3 (c) -1 (d) -2
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