1.

For any two real numbers a and b, \(\sqrt {{{\left( {a - b} \right)}^2}} + \sqrt {{{\left( {b - a} \right)}^2}} \) is

A. always zero
B. never zero
C. positive only if a ≠ b
D. positive if and only if a > b
Answer» D. positive if and only if a > b


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