railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) Mathematics Quadratic Equations

যদি x2 + kx + k = 0 পুনরাবৃত্ত মূল থাকে, তাহলে k এর মান কত হবে?

1
k < 0 অথবা k > 4
2
কেবলমাত্র k = 4 
3
k = 4 অথবা k = 0
4
0 < k < 4
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