Question

Write the greatest $4-\mathrm{digit}$ number that can be formed by the digits $0,2,7$ and $5$, using each digit only once.

Answer 1

Here we have to form the greatest $4-\mathrm{digit}$ number using digits $0,2,7$ and $5$, using each digit only once

Here descending order of digits are $7>5>2>0$

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

Here the greatest digit is $7$ So it must start with $7$

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

Thousands	Hundreds	Tens	Ones
$7$	$5$	$2$	$0$

Hence the largest $4-\mathrm{digit}$ number that can be formed by the digits $0,2,7$ and $5$, using each digit only once is $7,520$