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2.Relations and Functions
easy
यदि $A = \{ 2,\,4,\,5\} ,\,\,B = \{ 7,\,\,8,\,9\} ,$ तब $n(A \times B)$ बराबर है
A
$6$
B
$9$
C
$3$
D
$0$
Solution
$A × B = \{(2, 7), (2, 8), (2, 9), (4, 7), (4, 8), (4, 9), (5, 7), (5, 8), (5, 9)\}$
$n(A × B) = n(A) . n(B) = 3 × 3 = 9.$
Standard 11
Mathematics