Which of the following is a surd?

FPSC Past Papers / All - Multiple-choice practice

  1. A. None of these
  2. B. √21
  3. C. √16
  4. D. √16 + √25

Correct answer

√21

Explanation

Explanation A surd is an irrational root. √16 = 4 (rational) √25 = 5 (rational) √16 + √25 = 4 + 5 = 9 (rational) √21 is irrational , so it's a surd .

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