Answer: [tex]4753[/tex]
Step-by-step explanation:
Given: The mystery number is a four-digit number.
The digits used to make the number : 5, 4, 7, and 3.
Since , 5 and the 7 are the two middle digits.
Then , the number would look like [tex]-57-\ or\ -75-[/tex]
The 5 comes after the 7.
Then , the number would look like [tex]-75-[/tex] [i.e. [tex]-57-[/tex] is not representing the mystery number]
The 3 is not the first digit, then 4 must be the first digit.
Hence, the mystery number should be : [tex]4753[/tex]
