2e between 10 and 20 }
b) A = { letters of the word 'FOOTBALL }
c) F= {x:x is a A factor of 18 },
d) M = (y:y is a multiple of 3.5 < y < 10),
Let's rewrite these sets in set builder method.
a) A {1, 2, 3, 4, 5)
b) B = { 2, 3, 5, 7)
c) C = 11, 4, 9, 16, 25)
d) D = {1, 2, 4, 8)
Let's list the elements and write the cardinal numbers of these sets
a) A = {composite numbers between 10 and 20).
b) B = {all possible factors of 12).