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.