A) 4
B) 5
C) 6
D) 7
Correct Answer: D
Solution :
Roots are non-real if discriminant < 0 i.e. if \[{{5}^{2}}-4.1\,k<0\] i.e. if \[4k>25\]i.e. if \[k>\frac{25}{4}\] Hence, the required least integer k is 7.
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