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

यदि x2 - 4x + 4b = 0 के दो वास्तविक हल हैं, 'b' का मान ज्ञात कीजिये। 

1
b = 0
2
b ≤ 1
3
b = +1, -1
4
b ≥ 1
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