2, 4, 6, 8, 10, 12, 14
That's a null set. All multiples of 10 are even.
They are 2 4 6 8 10 12 and 14
true
There are 10 numbers between 1 to 10 (inclusive).5 of those are odd and 5 of them are even.
109
If I understand the question correctly then a is a proper subset of u.
set of all even natural numbers less than 10 = {2, 4, 6, 8}
even numbers less that 10
10:4
That's a null set. All multiples of 10 are even.
(2, 4, 6, 8, 10)
10 belongs to the set "natural numbers", but it can also belong to whole numbers, and rational numbers
{2, 4, 6, 8, 10}
Choose one odd and one even
The complement of a set refers to everything that is NOT in the set. A "universe" (a set from which elements may be taken) must always be specified (perhaps implicitly). For example, if your "universe" is the real numbers, and the set you are considering is 0
10 belongs to the natural integer numbers
Of the "standard sets" -10 belongs to: ℤ⁻ (the negative integers) ℤ (the integers) ℚ⁻ (the negative rational numbers) ℚ (the rational numbers) ℝ⁻ (the negative real numbers) ℝ (the real numbers) ℂ (the complex numbers) (as ℤ ⊂ ℚ ⊂ ℝ ⊂ ℂ). Other sets are possible, eg the even numbers.