Question

Use the given digits without repetition and make the greatest and the smallest four-digit number.

$9,7,4,1$

Answer 1

The greatest number is formed by arranging the given digits in descending order and the smallest number by arranging them in ascending order.

So,

The greatest four-digit number using the given digits $9,7,4,1$ without repetition is $9741$.

The smallest four-digit number using the given digits $9,7,4,1$ without repetition is $1479$.