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Q.

Which of the following is an irrational number?

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a

0.101001000..........

b

1.5

c

√25

d

4

answer is A.

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Detailed Solution

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  • As we know that irrational numbers are numbers that cannot be expressed in p/q form, where q  ≠ 0. Also, we know that the non-terminating and the non-repeating numbers are also irrational.
  • Therefore, 0.101001000...... is a non-terminating and non-repeating irrational number.
  • Except  0.101001000....... all the given numbers can be expressed in p/q form, where q ≠ 0.
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