Question

From the digits $2,5,1,0,9$ make any four $7$-digit number using each digit at least once$.$ Arrange them in descending order$.$

Answer 1

First make any four seven digit number using $2,5,1,0,9$ each digit at least once$.$

Let us consider four $7$-digit numbers are$:$

$9012502$$,$ $5921012,$ $2105901$ and $1095209$

First digit in $9012502$ is $9$

First digit in $5921012$ is $5$

First digit in $2105901$ is $2$

First digit in $1095209$ is $1$

But $9>5>2>1$

therefore$,$ $9012502$$>$$5921012$$>$$2105901$$>$$1095209$

Hence$,$ the descending order of the given numbers are $9012502$ $,$ $5921012$ $,$ $2105901$ $,$$1095209$