Introduction to sets

Let A = { days of the week }
Find n(A).

Let B = { months of the year that do not have the letter r }
List the elements with the use of { } in your response.

(a)  

Let C = { factors of 12 }.

List all elements of C with the use of { }.

(a)  

Let D = { positive integers less than 30 that are multiples of 4 }
Find n(D).

Let D = { positive integers less than 20 that are multiples of 4}

List all elements of D with the use of { }.

(a)  

Describe J = { 1, 3, 5, 7, 9}

Let K = { isoclese, equilateral , right-angled, scalene}
Describe K.
K is a set of (a)   .

L = { right angle, obtuse, acute, reflex}
L is a set of (a)   .

M = { 4, 8, 12, 16, ..., 40 }
M is a set of ___.

If A = { 4, 6, 8, 10}
then
4 ∈ A.