If A = {2, 3, 5} and B = {5, 7}, find:
(i) A × B
(ii) B × A
(iii) A × A
(iv) B × B
(i) Given: A = {2, 3, 5} and B = {5, 7}
To find: A × B
By the definition of the Cartesian product,
Given two non – empty sets P and Q. The Cartesian product P × Q is the set of all ordered pairs of elements from P and Q, .i.e.
P × Q = {(p, q) : p Є P, q Є Q}
Here, A = {2, 3, 5} and B = {5, 7}. So,
A × B = (2, 3, 5) × (5, 7)
= {(2, 5), (3, 5), (5, 5), (2, 7), (3, 7), (5, 7)}
(ii) Given: A = {2, 3, 5} and B = {5, 7}
To find: B × A
By the definition of the Cartesian product,
Given two non – empty sets P and Q. The Cartesian product P × Q is the set of all ordered pairs of elements from P and Q, .i.e.
P × Q = {(p, q) : p Є P, q Є Q}
Here, A = {2, 3, 5} and B = {5, 7}. So,
B × A = (5, 7) × (2, 3, 5)
= {(5, 2), (5, 3), (5, 5), (7, 2), (7, 3), (7, 5)}
(iii) Given: A = {2, 3, 5} and B = {2, 3, 5}
To find: A × A
By the definition of the Cartesian product,
Given two non – empty sets P and Q. The Cartesian product P × Q is the set of all ordered pairs of elements from P and Q, .i.e.
P × Q = {(p, q) : p Є P, q Є Q}
Here, A = {2, 3, 5} and A = {2, 3, 5}. So,
A × A = (2, 3, 5) × (2, 3, 5)
= {(2, 2), (2, 3), (2, 5), (3, 2), (3, 3), (3, 5), (5, 2), (5, 3), (5, 5)}
(iv) Given: B = {5, 7}
To find: B × B
By the definition of the Cartesian product,
Given two non – empty sets P and Q. The Cartesian product P × Q is the set of all ordered pairs of elements from P and Q, .i.e.
P × Q = {(p, q) : p Є P, q Є Q}
Here, B = {5, 7} and B = {5, 7}. So,
B × B = (5, 7) × (5, 7)
= {(5, 5), (5, 7), (7, 5), (7, 7)}