State in each case whether A ⊂ B or A ⊄ B.

Question:

State in each case whether A ⊂ B or A ⊄ B.

$A=\{1,2,3,\}, B=\{1,2,4$,

 

Solution:

A ⊄ B

Explanation: A ⊄ B since 3∈A and 3∉B.

 

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