Any irrational number can be approximated by decimals. You can never write it exactly, since there are an infinite number of decimals, and these don't repeat.
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Pi is an irrational number
When a decimal can't be expressed as a fraction then it is an irrational number.
A decimal rational number can be expressed as a fraction A decimal irrational number can not be expressed as a fraction
An irrational number has a decimal representation that is non-terminating and non-repeating.
No.