What is unique digits?

Dear Student,

$$\begin{gathered} A number in which all the digits are different is called \mathit{u}\mathit{n}\mathit{i}\mathit{q}\mathit{u}\mathit{e}\mathbf{ }\mathit{n}\mathit{u}\mathit{m}\mathit{b}\mathit{e}\mathit{r}. \\ Every digit is unique if it is written alone, for example- 1,2,3,4,5,6,7,8,9 are all unique digits. \\ If two same digits are written in a number than it is not unique. For example- 22 \left(here 2 is not unique\right) \\ Similary, if we take number 12- then here 1 and 2 both are unique. \end{gathered}$$

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