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

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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.