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Which of the following is an irrational number?

A0.333…
B√5
C22/7
D3.14
Answer & Solution
Correct answer: B. √5
√5 cannot be written as p/q with integer p, q. **The other three are rational:** 22/7 by construction, 3.14 = 314/100, and 0.333… = 1/3.
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