a mixed number is a number that is a whole number with a fraction
so numbers that are mixed are greater than 1
so therefor since both have to be greater than 1, the fractions have to add up to equal 1
so the mixed numbers are (1 and x) and (1 and y) where x+y=1 so some examples are
1 and 1/2+1 and 1/2
1 and 1/3+1 and 2/3
1 and 1/4 +1 and 3/4
1 and 1/1000+1 and 999/1000
etc