Descending Order of Square Root Differences

CMAT 2025 · Quantitative Techniques & Data Interpretation · Medium · Quantitative Aptitude

Arrange the following in descending order. (A) 3−2\sqrt{3} - \sqrt{2} (B) 4−3\sqrt{4} - \sqrt{3} (C) 5−4\sqrt{5} - \sqrt{4} (D) 2−1\sqrt{2} - 1

Choose the correct answer from the options given below :

  1. A.

    A>B>C>DA > B > C > D

  2. B.

    D>C>B>AD > C > B > A

  3. C.

    D>A>B>CD > A > B > C

  4. D.

    A>C>B>DA > C > B > D

Answer

C

Explanation

Rationalize each expression:

  • (A) 3−2=13+2\sqrt{3}-\sqrt{2} = \frac{1}{\sqrt{3}+\sqrt{2}}
  • (B) 4−3=14+3\sqrt{4}-\sqrt{3} = \frac{1}{\sqrt{4}+\sqrt{3}}
  • (C) 5−4=15+4\sqrt{5}-\sqrt{4} = \frac{1}{\sqrt{5}+\sqrt{4}}
  • (D) 2−1=12+1\sqrt{2}-1 = \frac{1}{\sqrt{2}+1}

Since denominators follow: 2+1<3+2<4+3<5+4\sqrt{2}+1 < \sqrt{3}+\sqrt{2} < \sqrt{4}+\sqrt{3} < \sqrt{5}+\sqrt{4}, Inverting gives: D>A>B>CD > A > B > C.

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