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

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2.Relations and Functions

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

A

$6$

B

$9$

C

$3$

D

$0$

Solution

(b) $A × B = {(2, 7), (2, 8), (2, 9), (4, 7), (4, 8), (4, 9), (5, 7), (5, 8), (5, 9)}$

$n(A × B) = n(A) . n(B) = 3 × 3 = 9.$

Standard 11

Mathematics

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