First slide

Introduction to Relations (XI) on Sets

Question

If $A = \{2, 4, 5\}, B = \{7, 8, 9\},$ then $n (A \times B)$ is equal to

Easy

A

6
B

9
C

3
D

0

Solution

$A \times B = \{(2, 7), (2, 8), (2, 9), (4, 7), (4, 8), (4, 9), (5, 7), (5, 8), (5, 9)\}$
$n (A \times B) = n (A) . n (B) = 3 \times 3 = 9$

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