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The Arabs invented the number system that we know today (1, 2, 3, 4, 5, etc).
0 and negative numbers were later added.
Expression is the mathematical phrase made up of numbers and operations
There are 16 4-digit numbers that can be made up from 9 and 6.
16 characters - made up of a mixture of letters and numbers.
There are 25 possibilities fitting those rules.
if you add all the numbers up and dived them by the numbers of numbers