railway RRB JE (CBT I + CBT II) Mock Test 2024 Quantitative Aptitude Algebra Quadratic Equation

যদি x2 - 4x + 4b = 0 এর দুটি আসল সমাধান থাকে তবে 'b' এর মানটি নির্ণয় করুন।

1

b = 0

2

b < 1

3

b = +1, -1

4

b ≥ 1

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