First slide

Operations on Sets

Question

If $a N = \{a x : x \in N\}$ then $3 N \cap 7 N =$

Easy

A

21N
B

10N
C

4N
D

5N

Solution

$3 N = \{3 x : x \in N\}, 7 N = \{7 x : x \in N\}$
$\Rightarrow 3 N \cap 7 N = 21 N$

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