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B
3.141592
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C
2.78181818
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D
0.123223222322223.......
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Solution
The correct option is D0.123223222322223....... An irrational numberis any real number that cannot be expressed as a ratio of integers or represented as terminating or repeating decimals.
(A)227 is a rational number.
(B)3.141592 is a terminating decimal.
(C)2.78181818 is a terminating decimal.
But (D)0.123223222322223...... is a non-terminating and non-repeating decimal. Therefore, it is an irrational number.