Examples of the subset of the set of real numbers?

Answer 1

Each of the following is a subset of the real numbers: -- the odd numbers

-- the even numbers

-- the numbers greater than 4

-- the numbers containing the digit '7'

-- the abcissas of points in the 3rd quadrant

-- the first 269 multiples of 'pi'

-- the number of fish in each of the Seven Seas

-- the numbers that have the letter 'L' in their English names