Question

Write the smallest $4-\mathrm{digit}$ number that can be formed by the digits $0,1,3$ and $6$, using each digit only once.

Answer 1

Here we have to form the smallest $4-\mathrm{digit}$ number using digits $0,1,3$ and $6$, using each digit only once

Here ascending order of digits are $0<1<3<6$

We know that for a number to be the smallest, smaller digits must be at higher places in the place value table

A number can not start with the digit $0$

So it must start with $1$

Let's fill the digits in place value table such that the number must be the smallest

Thousands	Hundreds	Tens	Ones
$1$	$0$	$3$	$6$

Hence the smallest $4-\mathrm{digit}$ number that can be formed by the digits $0,1,3$ and $6$, using each digit only once is $1,036$