Write the following sets in roster from:
C = {x : x is a two-digit number such that the sum of its digits is 9}.
The elements of this set are 18, 27, 36, 45, 54, 63, 72, 81 and 90
So, C = {18, 27, 36, 45, 54, 63, 72, 81, 90}
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