Question

U = universal set = {0,1,2,3,4,5,6,7,8,9}

set A = {1,3,4,5,9}

set B ={2,4,6,7,8}

What is A ∩ B ?

• A. 6
• B. 4
• C. 3
• D. 7

Answer 1

The correct option is B 4

U = universal set = {0,1,2,3,4,5,6,7,8,9}
Set A is composed of some (but not all) of the numbers in the Universal Set “U”.

set A = {1,3,4,5,9}
Set A ⊂Universal Set “U” or A ⊂ U

Set B is also composed of some (but not all) of the numbers in the Universal Set “U”.
set B ={2,4,6,7,8}
Set B ⊂Universal Set “U” or B ⊂ U
Both sets A and B contain different elements (numbers), except for one common element: the number 4.
Therefore , A ∩ B = {4}