state gov Allahabad High Court Group D Mock Test Series 2024 Quantitative Aptitude Number System Rational or Irrational Numbers
For any two real numbers a and b, \(\sqrt {{{\left( {a - b} \right)}^2}} + \sqrt {{{\left( {b - a} \right)}^2}} \) is
1
always zero
2
never zero
3
positive only if a ≠ b
4
positive if and only if a > b