Set C is the set of two-digit even numbers greater than 72 that do not contain the digit 8.
First, two-digit numbers mean anything less than 100. Let's, list out our two-digit even numbers greater than 72 but less than 100.
C = {74, 76, 78, 80, 82, 84, 86, 88, 90, 92, 94, 96, 98}
The problem...
Two digit Numbers less than 56:
{10, 11, 12, ..., 55}
Two Digit Even Numbers of that Set:
{10, 12, 14, ..., 54}
Two Digit Even numbers Divisible by 5
C = {10, 20, 30, 40, 50}
Note: Even means you can divide it by 2 with no remainder. Divisible by 5 means the number ends in 5 or 0. Since it is...
C = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19}
Notice, we do not include 20 since it said less than, and not less than or equal to.