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)

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)

sirm3d · Answer

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

anonymous · Answer

what are the elements?

anonymous · Answer

im just confused on what the elements are?

sirm3d · Answer

those lowercase letters enclosed by { }

anonymous · Answer

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

sirm3d · Answer

n(A) = 5
=)

anonymous · Answer

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

sirm3d · Answer

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

anonymous · Answer

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

sirm3d · Answer

yup.

anonymous · Answer

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