Example Problems I — task. Mathematics CBSE, Class 9.

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Check whether

$7\sqrt{5},\frac{7}{\sqrt{5}},\sqrt{2}+21,\pi-2$ are irrational numbers or not.

Ans:

$7\sqrt{5},\frac{7}{\sqrt{5}},\sqrt{2}+21,\pi-2$ are .

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