Question

Given U = {15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25}, A = {16, 18, 20, 22}, and
B = {17, 19, 20, 23, 24}.

Find A′ ∩ B′. Do not skip to the answer. Show your work, finding A’, then B’ then find their intersection.

Answer 1

A' is the complement set of A

Answer 2

A = {16, 18, 20, 22}

A' = {15, 17, 19, 21, 23, 24, 25} .... this is the set of U but excluding everything in A (ie it's everything but set A). So start with U, then delete every element found in A.


B = {17, 19, 20, 23, 24}

B' = {15, 16, 18, 21, 22, 25}




Now union A' and B' to get

A' U B' = {15, 16, 17, 18, 19, 21, 22, 23, 24, 25}


This is just the combination of the two sets (ie dump all the elements from both sets A' and B' into A' U B' and remove any duplicates).

Answer 3

Can you do it please?

Answer 4

Question is asking for intersection, not union.

Answer 5

I posted the other one.

Answer 6

check this out A' = {16, 18, 19, 20, 22, 23, 24, 25}
B' = { 15, 19, 20, 21, 23, 24}
So A'∩B' = {{19, 20, 23, 24}

Answer 7

Ans?

Answer 8

yeah