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Railways PYQCBT 2 2017

RRB NTPC · Question 10

Arrange the numbers in descending order : 3√5, 2√8, 4√6

  1. 4√6 < 2√8 < 3√5

  2. 2√8 > 4√6 > 3√5

  3. 4√6 > 3√5 > 2√8

  4. 2√8 > 3√5 < 4√6

Show answer & explanation

Answer: (C) 4√6 > 3√5 > 2√8

Explanation

Write each as one square root: 3√5 = √45, 2√8 = √32 and 4√6 = √96. In descending order: √96 > √45 > √32, i.e. 4√6 > 3√5 > 2√8.