Question

. Which of the following is an irrational number?
a. √23
b. √225
c. 0.3796
d. 7.47878

Answer 1

a. √23 is a irrational number

b. √225=15 , not a irrational number

3. 0.3796 , not an irrational number

4. 7.478478, not an irrational number

so you should choose option a

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