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Which decimal expansion belongs to a rational number?

Class 9Rational and Irrational NumbersNumber Systems
  • A2.101001000100001...
  • B
  • C3.141592653... (π)
  • D0.181818... (18 repeating)

Step-by-Step Solution

A repeating block (18 here) means the decimal is recurring, hence rational. The others are non-terminating and non-recurring, hence irrational.
Answer: D) 0.181818... (18 repeating)

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