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Question

Which of the following is/are an irrational number?

A
π
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B
5
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C
7
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D
227
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Solution

The correct options are
A π

B 5

C 7
π is not a rational number. Often we mention it as 227, but it is not exactly 227; It is approximated to be so. π is the ratio of circumference and diameter of a circle.
Moreover, square roots of prime numbers are always irrational.

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