Write all 3 digit numbers taking each digit only once.

$2,0,5$

All three digits numbers

The given digits $=2,0,5$

we can make many numbers by following the instructions given below:

Fix any digit in the ones place and make a different number

repeat the above instruction until all numbers have been put in the ones place

Keeping $0$ in ones place we get$=250,520$

Keeping $2$ in ones place we get$=502$

Keeping $5$ in ones place we get$=205$

We can't make a number that starts with zero because it will be $\left(n-1\right)digit$ number

Thus,

All Three digits numbers obtained $=250,520,502,205$