Question

U = {x: x is a natural number and x ≤ 10}
$\text{A = {a : a is an even natural number and a < 10}}$

B = {b : b is a prime number and b ≤ 9}

What is the value of A^I ∩ B^I?

Answer 1

U = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}

A = {2, 4, 6, 8}

B = {2, 3, 5, 7}

A^I = U - A ≡ All the elements in U which does not belong to A

= {1, 3, 5, 7, 9, 10}

B^I = U - B ≡ Elements which belongs to U and does not belong to B

= {1, 4, 6, 8, 9, 10}

A^I ∩ B^I = {1, 9, 10}