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When decimal representation is of non-terminating repeating nature.
In a non terminating repeating decimal, there are two types of decimal representations

A decimal in which all the digit after the decimal point are repeated. These type of decimals are known as pure recurring decimals.
For Example: 0.6¯¯¯,0.16¯¯¯¯¯,0.123¯¯¯¯¯¯¯¯ are pure recurring decimals.

A decimal in which at least one of the digits after the decimal point is not repeated and then some digit or digits are repeated. This type of decimals are known as mixed recurring decimals.
For Example: 2.16¯¯¯,0.35¯¯¯,0.785¯¯¯¯¯ are mixed recurring decimals.