Types of decimal numbers

Define an exact decimal number $a$, a pure periodic decimal number $b$ and a ultimately periodic decimal number $c$.

$$a=2,654$$

$$b=13,\widehat{187}$$

$$c=19,13\widehat{76}$$

$$a=2,654$$

$$b=13,\widehat{187}$$

$$c=19,13\widehat{76}$$

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