Question

Write the smallest and the greatest numbers of 4-digits without repetition of any digit.​

Answer 1

Step1: Finding the largest and smallest 4-digit number without repetition of digits ​

We know that,​

$9>8>7>6>5>4>3>2>1>0$

​As we cannot use 0 as the first digit from left, ​

Thus, the smallest 4-digit number without repetition of any digit is 1,023.​

The greatest 4-digit number without repetition of any digit is $9,876.$

Hence, $1,023$ is the smallest and $9,876$ is the greatest four-digit numbers without repetition of any digit.​