Expression is the mathematical phrase made up of numbers and operations
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You can make 24 numbers by rearranging the digits. However, you can make vastly more if you allow mathematical operations on the digits. For example, 3+5*8-6 = 37.
A mathematical model is made up of mathematical equations and data
A mathematical model is made up of mathematical equations and data.
There are 24 number made by permutations of the digits. There are lots more if the digits can be repeated, for example, 27335722. Even more can be made by using arithmetic and algebraic operations, for example 35^27 = approx 4.8960*10^41. You have not specified what the rules for "making" numbers are!
pytagoras made one that i know of and that is the pythagorean therom