Question

which one of the following is an irrational number a) √1 B) 3√8 C) √100 D)√0.64

Answer 1

b)3root8
as the value of others can be evaluated

Answer 2

Hey dear
$\sqrt{1} = 1 \\ 3 \sqrt{8} = \sqrt{72} \\ \sqrt{100 } = 10 \\ \sqrt{0.64} = 0.8$
72 is not a perfect square.
Hence answer is option (b).


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