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Correct answer: C
Explanation
Given:
√{[(5.1)² + (51.1)² + (511.1)²] / [(0.51)² + (5.11)² + (51.11)²]}
5.1 = 51/10, 51.1 = 511/10, 511.1 = 5111/10
Numerator = (1/100)(51² + 511² + 5111²)
0.51 = 51/100, 5.11 = 511/100, 51.11 = 5111/100
Denominator = (1/10000)(51² + 511² + 5111²)
Fraction = (1/100) / (1/10000) = 100
√100 = 10