Question

U = {a, c, d, f, h, m, p, r, t, w}
A = {a, c, f, r, t}
B = {a, c, m, t}
C = {d, m, p, r, t}
note n = total number of elements

Find:

a) n (A)

b) n (A ∪ B)

Answer 1

count the elements. count duplicates only once, particularly in (B)

Answer 2

what are the elements?

Answer 3

im just confused on what the elements are?

Answer 4

those lowercase letters enclosed by { }

Answer 5

so it 5 {a, c, f, r, t}? what do i do from here?

Answer 6

n(A) = 5
=)

Answer 7

ok that sounds better lol. what about the next one?

Answer 8

join as one big set the elements of A and B, then count, counting only once duplicates

Answer 9

{a,c,f,m,r,t} and that = 6?

Answer 10

yup.

Answer 11

thanks so much! i can finally go to sleep your a life saver!