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1.Set Theory
easy
Find the union of each of the following pairs of sets :
$A = \{ x:x$ is a natural number and multiple of $3\} $
$B = \{ x:x$ is a natural number less than $6\} $
Option A
Option B
Option C
Option D
Solution
$A = \{ x:x$ is a natural number and multiple of $3\} = \{ 3,6,9 \ldots \} $
As $B = \{ x:x$ is a natural number less than $6\} = \{ 1,2,3,4,5,6\} $
$A \cup B=\{1,2,4,5,3,6,9,12 \ldots\}$
$\therefore A \cup B = \{ x:x = 1,2,4,5$ or a multiple of $3\} $
Standard 11
Mathematics
